What is the most painless transition for Genesis 3 and 8 characters? 

To waht other software can I go at all and keep:

posing

morphs (both expressions and figure morphs, visible and hidden, so JCM, MCM and shaping)

and with resonable material convesion effort? 

Best solution would be open src, so Blender comes to mind, and I know there is a 3rd party software that is said to do a better job than the Daz bridge but is not easy to use.