Daily update: I appear to have successfully implanted the script into Poser. Grabbing the correct mesh data from the API (as in, matching what Poser would produce in unwelded/welded OBJ exports) proved more tricky than expected, but I got that working literally fifteen minutes ago.

Tests and cleanups to be scheduled for tomorrow. Also I'll see if I can get profiling to work from inside Poser so that I have a better idea of which parts take how much time. The general impression though is that the script is not significantly slower than the command line version.

ETA: Probably time to move to the Poser Python forum soon, since from here on I suspect it'll be mostly about GUIs and APIs.

-- I'm not mad at you, just Westphalian.