You can switch in different obj files with different mapping using a dial. It's called "geometry switching" and it's part of Poser though it's not used much anymore. It could also switch materials and material zones as that is also referenced from the obj file. With a master dial you could also adjust all of the body parts at once. The product that I made and sold here had over a hundred different obj files that could be dialed in. That was a long time ago.

As I recall if the obj files are identical geometry wise, (Same number of vertices) you can still use morphs that affect that body part. I'm not positive about that though, experimentation would be needed.

My old product Dial-A-Tile was in freestuff untill about a year ago when my ISP dropped web space.