Imagine if we could take a 5 piece set and then destroy it in order to acquire the 5 piece bonus as a skill that can go into a slot on some kind of Spell Extraction skill line.
Obviously this would only work with sets that have some sort of proc effect and you would need to balance it by not allowing it to stack with the set it came from. And not all sets, so no trial sets.
Eg
Icy Conjuror would become a Frost Wraith DoT skill that can be slotted.
Winterborn would become a ranged spammable.