FWIW, I've now had some success getting XPS to Poser.

Free XNA/Lara can load XPS, export as generic.mesh.ascii, which free Noesis can export as rigged FBX that Poser may read. Downside, will probably import to Poser as multiple sub-rigs. At least textures usually auto-load, PNG quirks permitting. Trick is to find which sub-rig works the skeleton's bones. Usually first in list, but...

If lucky, figure may be posed with care, while the fabrics, props etc politely follow along...

https://www.deviantart.com/higuys920/art/Wonder-Egg-Priority-Rika-Kawai-3D-Model-905990312

The freebie's supplied FBX showed 'all black' in Poser, I could not match all its materials to textures, so I ported the XPS via route above...