The thing is, without new/her PSP animations, the mod'd end up just being Jean Grey - 1 or 2 powers + 1 or 2 new ones. It's like making two versions of the same character (technically, it isn't like making two versions of the same character, it is making two versions of the same character)
That is why I believe there is a total apathy towards making DP, as opposed to Cannonball/X-Man/Cable, who are all pretty unique.