The initially posted scripts still work, of course.  The process won't return better morph transfer results now than at first, but the processing will be much faster with the final build of the vertex-to-vertex script than it was with the initial release.  That, unforutnately, means I never found a way to overcome the low res to high res problems.  JoePublic's successes are still possible elsewhere, however.  If you want to know about Sydney to V3, you'll have to try it.  Use the final vertex comparison script if and when you test.  It will be faster than the first script that was posted.

Nobody should use the "class" I posted!  It does organize the data into nice, useful lists, but those lists, when actually used for anything, create ugly reference loops which seem to be the source of much of the RAM problem with the later vertex-to-polygon efforts.

I am still tinkering with the above code.  I'm managing to clear a lot of garbage references, finally, but the RAM isn't being released - apparently there are still unrevealed cycles somewhere.  But I've finally figured out how to track the number of references to objects.  Perhaps that can lead somewhere.  I'm not overly optimistic, however.  Don't hold your breath.  :)

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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.