Lore wise, there is no such thing as norm/nm/hell as much as normal/exceptional/elite. Everything is on the same tier, so it makes sense that if there is an elite version of Death web there is an elite version of Ice blink with hell capabilities
and set that can be upgrade now have alternate versions
Meaning a Normal Unique now has a Exceptional and elite version
Not only the base gets upgraded but there can be a buff to its affix or additional ones
Example 1(affix buff)
Rixot keen [normal]
+100% Enhanced Damage
+5 To Minimum Damage
25% Chance of Crushing Blow
20% Bonus to Attack Rating
+25 Defense
+2 To Light Radius
Rixot keen [exceptional]
+300% Enhanced Damage
+50 To Minimum Damage
25% Chance of Crushing Blow
20% Bonus to Attack Rating
+150 Defense
+2 To Light Radius
Rixot keen [elite]
+400% Enhanced Damage
+50 To Minimum Damage
25% Chance of Crushing Blow
20% Bonus to Attack Rating
+250 Defense
+2 To Light Radius
———
Or
——-
Example 2(additional affix)
Iceblink [Normal]
+70-80% Enhanced Defense
Freezes Target
Cold Resist +30%
Magic Damage Reduced By 1
+4 To Light Radius
Iceblink [Exceptional]
+150-200% Enhanced Defense
+2 cold skills
Freezes Target
Cold Resist +40%
Magic Damage Reduced By 10
+4 To Light Radius
Iceblink [Elite]
+200-250% Enhanced Defense
+3 cold skills
Freezes Target
Cold Resist +50%
Magic Damage Reduced By 20
+4 To Light Radius
This kind of system would help a lot of unique items to become way more interesting and for longer at the cost of an upgrade recipe (could be changes to fit the magnitude of upgrade)
These items would also not only be acquirable by upgrading, it would also be added to the game table of drops
Instead of adding new items to the game you have this novelty through existing ones
Ofc this doesn’t fix the bad Elite ones but at least a good chunk would be adressed