Well, fazz bazz.  My "kludge" rotation method fails, now that I'm appying some more robust tests.  So the core function of this script is not really yet in place, and the script as posted above is still knackered.    My apologies to all two of you who are following this thread.  :-P

3D rotations are tricky beasts.

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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.