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can't you just export the new uvs Mike? Just curious ;o).

Actually, yeah. Well, not really, not exactly in that way.
I just discovered UVLayout's "Update" feature. Pretty neat. I probably read about it in the help file but wasn't paying attention, and have just assumed that big "Update" button was for checking for updates.

But no...
You have your new UV object loaded into UVLayout and click the Update button and browse to a similar or exact OBJ file with the UVs you want to paste to.
In this case I tried the recent Antonia-114.obj file and then UVLayout makes a copy of that file in the same folder, but with the new UVs. Nothing else is changed but the UVs.
I tried that object in Poser and loaded Antonia's rig onto it and it worked just like the real Antonia.

I still have to finish the new UVs, but I'm not going to have to worry about point reordering or anything like that.
Amazing what you can find in help files sometimes. ;-)