I would allow it under one condition: Justify it to me. If you can justify something to me with a logical, well put-together defense, I'll allow just about anything you want. On the other hand, I will never allow justifications like, "It would be really cool!" or "Because it's magic!" but maybe that's just because I like players to have to think a tiny bit.
Past that, I personally like the idea. Currently as the game scales, power-wise, pure mortals tend to trail behind magical folk due to stunts just not having the same bang that powers do. Creatively stacking stunts like this is a pretty good counter that I've been toying with.