It seems to me a "texture converter" would be much more wasteful than a UV conversion tool, since you really only need to create the file (after modifying the UV coordinates) and then create a copy of the CR2 to correct the .obj reference and then change material names, if necessary. If you have 100 megs worth of V4 textures and then convert them all to 4 other characters, you end up with 500 megs of slight variations of the same textures. 

I'd be interested in v4->Dawn, as long as the results look good. I have no interest in making modified copies of all of the characters, though. That just seems like a waste of diskspace. 

Also, I'm a mac user, in case anyone is keeping track.