Not sure if I'm addressing this correctly (re: the material zone limitation) but really V4's material zones can be condensed ... I really only have 6 for the main body. Then the eye would be a separate object: there's like, what? 5 or six there?
The really fun bit is going to be translating Poser shader nodes to Blender's node system, which at first glance looks a bit like Daz Studio's.

Really need a LOT more hours in the day.

But I think that is sage advice: start with a simple object with a few materials and work up from there.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks