Here's a quick fix which at least has UV-mapping which isn't snarled.  Dull and not altogether useful planar mapping is applied here.

I'll try to get the per-ring UV handling set up tomorrow.  Looks like the texsets array is not being constructed properly, so the indices are snarled up in surprising ways.  The results look okay in UV Mapper if you just glance, which is all I did earlier.    Look more closely and the flaws are evident.

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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.