Coolio, I'll clean up the script a bit then and write down some instructions when that's done. No worries about the technologies. The script is standalone and should work fine with either Python 2 or 3, but I'll double-check that. I've used the same strategy for making Poser render out texture map back in 2010-ish, so your Poser Pro 2014 will do just fine.

UDIMs have been working nicely with Poser since at least Poser 6, probably earlier, although we didn't call them UDIMs then (at least I know I hadn't heard that term). I was told back then that some of the other tools that people liked to use didn't, which is why Antonia's original UVs are not using UDIMs. But no part of the process actually requires UV manipulation as such, so there wouldn't be a problem even if your Poser version couldn't handle UDIMs.

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