Okay.  I've got it working.  :D  It's all fairly straightforward.

Thanks for the suggestion about the bounding boxes.  That has helped speed things up.

Now... I'm working on trying to figure out how to use the .pyd collision handling to do cloth polygons to actor vertices, instead of cloth vertices to actor polygons.  Presumably that would handle corners better.  So the script is currently a bit of a mess.  I'll work on it a bit and post later tonight....

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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.