Thanks @FVerbaas, @RedPhantom and @primorge for all the helpful comments! I'll go through them in chronological order.

FVerbaas posted at 4:44 AM Sun, 31 October 2021 - #4429628

I am not that concerned about morphs. Poser's morph copy tool works pretty well provided the mesh surfaces coincide. A good pose or morph is 90% of the job.

That's reassuring. Somehow I was under the impression that transferring morphs might be more problematic. Will have to do some tests when the time comes.

I would think poses are the primary problem. Antonia has a different arms position and of course a different hierarchy in general than most other figures. 

For Project Evolution, also featuring some private rig solutions, there is an excellent pose Converter by Nagra_00_: https://www.renderosity.com/freestuff/items/80991/poseconverter-data-update-v04-for-pe. It formally takes only V4 poses but results for V3 and even Schlabber's V2 based poses come out very well. My PE has about the largest collection of poses of all figures in my Runtimes. Something similar for Antonia(2) would take away many hurdles.

A pose converter sounds like a great idea. I have no idea how to go about writing one, but pretty much all this stuff is learn-as-I-go for me, so no sweat. :-)

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