They can do something like this:
They can change Demonic to grant Chaos Blades, and not grant the Demon form, thus decoupling them. Then you can buff Meta to also include the Chaos Blades effect, which would make it a stronger damage cooldown.
the uptimes you end up over the course of a 240 second fight would be:
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With Demonic - 8x6 seconds of Chaos Blades (8 eyebeams each granting 6 seconds of Chaos Blades) + 6 sec of Chaos Blades (from chaotic transformation) + 6-12 sec of Chaos Blades if you go Cycle of Hatred and can fit 1 or 2 more Eye Beams in the 240 sec window + 30 sec of Chaos Blades from Meta, and 30 seconds of the current Meta effects. So around 78 seconds of Chaos Blades, before other talents + 30 seconds of current Meta effects.
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With Demonic Origins. Say it lowers Meta CD to 120 seconds, and duration by 5 seconds to 25. In 240 seconds, it’s 50 seconds of Chaos Blades + 50 Seconds of current Meta effects, before Shattered Destiny.
So Demonic would end up with higher uptime on Chaos Blades, while Demonic Origins would end up with a higher uptime on the current Meta effects, which would make it easier to balance, as they can be adjusted separately.
There is further opportunity for flavor, with Chaos Blades maybe buffing just Chaos Damage and pairing well with Any Means Necessary, which would make Demonic stronger in this combination.
Restless Hunter and Inner Demon would need to be reworked to activate from gaining/losing Chaos Blades, but that’s an easy fix I suppose.