Based on the conversation here, I did make some changes to my proposed suggestions…
Which were all added to the original post, including a change to Grand Warlock’s Design, its original effects made baseline, Dimensional Rift becoming a passive involving Ritual of Ruin, Eradication and Ashen Remains becoming 1-talent point nodes, Rain of Fire being made baseline, Flames of Xoroth instead granting a 2nd charge to Conflagrate, AND the following Demo talent to replace the ‘Summon Doomguard’ I mentioned earlier in this forum thread.
Demonic Discord
Shadow Bolt and Demonwrath have a chance to sometimes summon a Soulkeeper for 6 sec at the enemy’s location that pulses for Chaos damage.
Implosion has a lower chance to summon a Soulkeeper, increased for each Wild Imp imploded.
Now, the big edit here, is instead of explaining all of that (since I edited it into the original post, I’m gonna delve into the abilities and talent interactions with the permanent cooldown pets! 
Darkglare (Affliction)
- Eye Beam: 2 sec cast, 40 Energy, 40 yd range. Deals Shadow damage to the target, increased by 10% for every damage over time effect you have active on them.
- Seize Magic: Instant, 20 Energy, 40 yd range, 15 sec CD. Purges 1 beneficial Magic effect from an enemy or 1 hostile Magic effect from an ally, and if an effect was removed from an enemy, reduce the target’s movement speed by 50% for 15 sec. Grants Darkglare 60 Energy if an effect was removed. Autocast: Cast upon master when they are unable to cast spells due to a Magic effect.
- Optical Blast (Command Demon): Instant, 40 yd range, 30 sec CD. Blasts an enemy’s spellcast. If a spell was countered, prevents any spell from that school from being cast for 5 sec and reduces the cooldown of Optical Blast by 6 sec. Otherwise, silence the target for 1 sec if no spell was countered.
- Shadow Lock (Sacrificed Command): Same as Optical Blast, just renamed.
Talent interactions with Darkglare:
- Malevolent Visionary: Eye Beam deals an additional 5/10% damage for each damage over time effect present. Grimoire of Sacrifice deals 3/5% increased damage for each damage over time effect present (if Darkglare is sacrificed).
- Dark Messiah (one of my custom talent, its a choice node with Grim Reach and changes Darkglare to instead freeze the duration of your dots while active): Eye Beam increases the duration of all your active damage over time effects by 0.5 sec. Grimoire of Sacrifice procs increase the duration of all your active damage over time effects by 0.1 sec (if Darkglare is sacrificed).
- Grim Reach: Eye Beam deals the bonus damage granted by Malevolent Visionary to all enemies affected by your damage over time effects. Grimoire of Sacrifice procs deals reduced damage to all enemies affected by your damage over time effects (if Darkglare is sacrificed).
In short, Darkglare works like a Imp+Felhound!
Doomguard (Demonology)
- Doom Bolt: 1.5 sec cast, 40 Energy, 40 yd range. Deals Shadow damage to a target. Applies Curse of Doom for 20 sec, causing additional Shadow damage every 20 sec it is active on a target, or if dispelled.
- Destroy Magic: Instant, 20 Energy, 40 yd range, 15 sec CD. Purges 1 beneficial Magic effect from an enemy, and if an effect was removed, reduce the target’s movement speed by 50% for 15 sec, while also granting the Doomguard 60 Energy.
- Shadow Lock (Command Demon): Same as Optical Blast, just renamed.
Talent interactions for Doomguard:
- Nether Portal (remember, as noted above, Nether Portal in my wishlist became a passive when you cast Summon Tyrant, he leaves the portal he emerges from open, allowing you to beckon forth demons for his duration of 15 sec): 1.5 sec cast, 1.5 min CD. Opens a portal to the nether for 15 sec (it changes back into an active ability).
- Dark Apotheosis (as noted above, I put this as a split talent with Nether Portal, replacing Demonic Tyrant, instant cast, etc): Instead of gaining Summon Doomguard, Dark Apotheosis is permanent, though instead of its normal effects it instead causes you to pulse Demonwrath around yourself while channeled, AND your Mastery increases your own damage done too. Gain Demonic Leap as an extra ability, as Dark Apotheosis is now a ‘stance’.
- Ner’zhul’s Volition (My version was gain Demonic Cores when Tyrant/Apotheosis fades, and a Mastery buff for either X demons called during Tyrant, or the damage buff to Apoth lingering, but fading over time): Your Doomguard’s Doom Bolt has a 5% chance to grant 1 stack of Demonic Core. While in Dark Apotheosis, Demonbolt has a 5% chance to grant 1 stack of Demonic Core. Spending Demonic Core’s increase your Mastery by 1% for 10 sec. Multiple stacks can overlap.
- Gul’dan’s Ambition (Mixture of Pit Lord summoning for Nether Portal, damage boost to Tyrant, and ability transformation for Dark Apotheosis. Also note, I removed Sacrificed Souls and worked it here for Grand Warlock’s Design users): Each active demon increases your Doomguard’s ‘Curse of Doom’ damage by 5%. Nether Portal still summons a Pit Lord at the end, and Dark Apotheosis continues to transform Hand of Gul’dan into Chaos Wave, and Demonic Breath into Carrion Swarm, but no longer causes Shadow Bolt to steal life from your demons for extra damage, and instead buffs the damage of your single target spells by 5% for each demon active.
In short, Doomguard is also like an Imp+Felhound! Its health is about equal to a Felguard’s though, and it’d be too long and complex to go over -every- talent interaction in the Demo tree due to my makeover to it, so I kept it to just stuff relating to Tyrant. Rest assured, in my wishlist, any talent specifically referring to Felguard was tinkered with to apply to all demon pets, with the sole exception of Soul Strike. Demo still get Felguard as a cool special pet, but you aren’t required to use it! 
Infernal (Destruction)
- Seethe: Instant, 30 yd range, 10 sec CD. The Infernal taunts the target to attack it for 5 sec, and increases its threat against the target. Autocast: Taunts the current target if it is not attacking the Infernal and taunts any target who attacks its master.
- Burning Presence: Instant. Radiates Fire damage to nearby enemies every 2 sec, and increasing threat generation. Has a 40% chance to generate a Soul Shard Fragment. Autocast: Always keep this effect active.
- Blaze Magic: Instant, 30 yd range, 15 sec CD. Burns harmful spells, removing 1 harmful Magic effect from an ally. Autocast: Cast upon master when they are unable to cast spells due to a Magic effect.
- Meteor Strike (Command Demon): Instant, 25 yd range, 45 sec CD. The Infernal jumps into the air, assuming its meteorite form, and crashes into the target! Stunning and interrupting them for 4 sec, and knocking down nearby enemies.
- Meteor Burst (Sacrificed Command): Instant, 45 sec CD. Release a powerful burst of flames around you, dealing Fire damage to nearby enemies and stunning them for 3 sec.
Talent interactions for Infernal:
- Infernal Brand: Affects Burning Presence instead of Immolation Aura. Grimoire of Sacrifice also builds up Infernal Brand if Infernal is sacrificed!
- Crashing Chaos: When you use Meteor Strike/Burst, it empowers your next 2 spells.
- Rain of Chaos: While infernal is active, or if it is sacrificed, your spells have a 3% chance per Soul Shard spent to call down an infernal for 8 sec. These Infernals still trigger Infernal Brand like normal!
- Lord of Flames: Every 15 sec Meteor Strike/Burst is off cooldown, it gains a charge of Fiery Command, and consumes all charges to summon that many infernals for 8 sec (still a max of 4 charges). These Infernals still trigger Infernal Brand like normal!
In short, Infernal is treated like a mix between Felguard and Voidwalker, with Imp’s burn magic and an AoE damage aura to boot!