If you have the DSON installed into Poser and all the files installed, go the Mec4D's site. 

IIRC, she has a python script that works with DSON and changing UV's.  I didn't bother with it because I ended up dumping DSON, Genesis and all related files as too fiddly and time consuming.

Also check Dimension3D's site.  He has some scripts for the DSON as well. 

I don't know if 3D Universe will add plugins for Texture Convertor 2 that would allow conversion between the Gen 4 and Gen 5 textures.  You could always email and ask.