It looks like I'm not going to get UV transfer working as desired, at least for the time being.  The attached is as far as I got with it.  The texverts are being split at what seem to be the best match locations.  Some sort of handling to move these split texverts into better locations should be the next step, presumably.  Anyone who wants to tinker with the attached code should feel free to do so.

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.