There's a long way to go with this.  :(  I'm spinning some horrible spaghetti code.  Anyone who's interested in "fighting the spaghetti" should, perhaps, try to take this basic idea and make of it something that works.  Fight the spaghetti!

Umm.

I should have a minor update later.  The basic functions present in the initial post weren't working as well as I believed, but that seems to be fixed now, thanks to some helpful input from Ockham.  So the script is currently pretty good at copying from a higher-res actor to a lower-res one.  The trick is going to be working in the opposite direction.  It's looking to me like the whole premise may need to be re-thought to approach that effectively....
 

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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.