Something I just thought about, what about teaching Reed magic from a different setting other than marvels? Setting him up in the world of full metal alchemist and raising him there while seeing to it that he learns alchemy?
With his mind fueling it, Full Metal Style Alchemy would be a much more broken power than his stretchiness.
Rubber Mind Alchemist: "Who wants Time Dilation Belts?"
A Flock of Sheep.
A Pack of Wolves.
An Inconvenience of Heroes.