I happen to be working in BodyPaint v2 today for the first time, and I can tell you that the workflow is much more streamlined than it was in V1 (if you have the money to upgrade). I have made skin textures in v1 for the Maya Doll, but not the DAZ figures. I haven't done any skin textures in v2 yet. I'll give it a try and let you know how it goes. The UV mapping would stay the same, it's getting everything you need on the right texture map. I'm guessing this shouldn't be a problem because in version 2 you're given the option of which parts you want to work on at the same time and whether or not you want to keep them on one map, so you should be able to group the body parts as needed on the same map. I don't think you could do this in v1, but I really didn't work with it much, so I may well be wrong.