I think it'd be amazing too. However based on how the models are made, I don't think they're easily converted to morphable meshes.
There's another game which I can't mention because it's a massive, massive spoiler for the plot, but the way that works is you pick two meshes, and then you have a slider where the far left is mesh A, the far right is mech B: anything between is a mix you decide upon. I think GTA5 online did something similar? Problem is as others have aid I think this 'simple' thing is a massive, massive slog that will probably compromise the originals. I would prefer the current system, because I am gifted at making potato faced characters to the point I usually take the 'stock' face.
