Hypothetically, Python will just garbage-collect those list references once they no longer appear in the code.  I don't know that you actually have to clear them at all, unless you've set up something that keeps them lingering in some way I don't understand.  I was doing a lot of experimental list-clearing in the early stages of TDMT, because I kept setting up reference looping without realizing it.  I think that's under control now in TDMT, and as far as I can tell, it shouldn't be a problem in your test script.

You said to do nothing, but I can't resist trying to port a simplified version of shrinkwrapping to this temporary .pyd, just to see.  We'll see what happens....

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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.