OT but.

NikKelly, have you ever considered posing your exotic format figures in XNALara and exporting from there as obj and importing into Poser as static props? It works like a charm for ripped game models and such (epidemic proportion amounts of those available, some, nay, alot of them gorgeous). Just a matter of scaling, translation, and connect the relevant maps to image map nodes. Thus you can skip the whole FBX thing if you want model/figure variety in Poser simply as furniture. Some of the game engine transparency maps translate strangely to Poser but you know this. Anyway, XNALara seems like something that would be right up your alley... it's quite feature packed also as far as manipulation options. Also CATS Blender plug in would probably be very useful to you also but you mentioned that you don't care for Blender...

https://github.com/absolute-quantum/cats-blender-plugin

https://xnalara.forumotion.com/t327-xna-posing-studio-11-8-9-view-mode-edition-release-189

XNALara requires a couple simple hoops to get up and running but I was really surprised by the nifty little software. 

Hope those links don't TOS violate. Nothing commercial there and I've tested both linked and found them quite well made.

Anyway.