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The problem is that most meshes don't line up very well without some work.  Some actors may require rotation, translation, morphing, or magnets or other deformation in order to get a decent correlation run out of the script.
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Maybe I can try running a test in p5 on a XP machine.

Can you show examples of how to line up heads, and/or figures?

Have you tried changing the scaling for a better transfer? That's a trick that worked out well for Wardrobe Wizard clothing transfers of adult to child. Looking at the Monkey head transfer, I'm thinking something like that will improve transfers.

Also, I can clean up a morph transfer in Blacksmith. So errors on places like the teeth, tongue, inner mouth, eyelashes, etc, can easily unmorphed back to the default. Lumps can be smoothed, etc.

I would really love to give it try.  ^^

bB