Quote -

I won't abandon the other mapping, though. At the very least, I will include an extra set of cr2s. Preferably, we'd come up with a simple way to switch  the geometries whenever the user loads a material set made for the alternate mapping.

I have successfully tested a way and how you can transform using a pz2 in Poser between different OBJ with other material areas created. I have tested this on a Testobjekt and it works.