Would it be faster and easier to work on the .obj file level?  Then you could just scan the file and replace the vt lines, then save with a new filename.  You'd have to save the current scene, then edit the appropriate figure geometry references.  The order of the vt lines would have to be constant between any data file and the target obj, or else some sorting would be required.  If the bottleneck is the geometry API, though, and there's no intent to try to move into animating the effect, that might speed things up.  :unsure:

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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.