While brainstorming themed builds with friends we came across an idea that could be fun - allowing crafters/enchanters the ability to convert the enchantments from 2 piece monster helm sets into 5 piece sets. It could create some interesting builds by allowing players to utilize multiple monster helm enchants in their builds, at the cost of using up a 5 piece slot.
Examples:
Daedric Summoning build with Shadowrend + Maw of the Infernal
Burner build with Valkyn Skoria + Grothdarr + Infernal Guardian (5+5+2)
Arachnaphobia build with Swarm Mother + Spawn of Mephala
Ground-pound build with Tremorscale + Sellistrix
Dwemer construct build with Engine Guardian + Sentinal of Rkugamz
Storm-chaos with Illambris + Stormfist
Decisions would need to be made on how to allow players to fill in the 2, 3, and 4 piece slots upon conversion from a 2 piece set to a 5 piece set. Overall, this is an idea that might be worth thinking about because it's fun to use monster sets, and giving us the ability to use more than one (again, at the cost of 5 pieces) could create some really fun builds by pairing some of the coolest sets in the game.