The Poser export options are indeed poor. It should be self-evident for a 3D application to support the FBX format.

Anyway, what do you mean with the first who succeed at this? At transferring skin weights from a base character to another character set?
It actually worked without an error message. Only warning messages that some bones could not be found on the target character. That was because I made my own rig where I deleted the Buttocks bones and made some other changes. But as I said the skin weights produced a total mess. When I rotated for instance the right shoulder half the face was moving with it :-D

Btw, do you or anybody else here also have difficulties in painting manual smooth skin weights onto the V3 character in Maya? I get strange shading discontinuities in a lot of places although I smooth them out like crazy. I might do something wrong, because I am new to weights painting with the artisan interface in maya, but right now I can't recall that I made any major mistakes. I followed all the steps as outlined by A. Alvarez from Gnomon Workshop.
Or maybe the shader translation done by BodyStudio (which I used) made these discontinuities too obvious.
But I read very often about the poor topology of many Daz characters. Maybe this caused the prob...I dunno.
Any advise?