Are you doing the regrouping in Poser or Blender? Grouping in Poser drives me bonkers. I find it far easier to do it in Blender.

Just import the mesh into Blender with the UVs, keeping vertex order, and without the group info, Scale it up so you can work on it easier if needed, then group to match whatever skeletal structure you want to use. Export it with the UVs, keeping vertex order, and the new grouping you just made. When you import it into Poser, you will have to scale it back down to the proper size if you scaled it up in Blender to work on it.

If you want to change the UV mapping to use another characters maps you can do that as well while you are at it. Mark the UV seams on the mesh to about match the other characters map seams, select the vertexes that will be on the UV map. Import the UV template for the character you want to match as your UV image. Then adjust the mesh to match it for each UV map. Repeat for all the UV maps that you will need. then export the character.

I don't have the latest version of Blender installed, with the older versions you will have to go into the obj file after you export it and correct the group names. For some reason it changes the names you assign to the groups. Not sure how the newest version handles the group naming. Any decent text editor will make quick work of that.

 

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