To further test G8 poses and clothing in P12, I exported a DAZ outfit as a PCF and imported it into P11 through DSON. I did a quick pose and adjusted any pokethroughs with the Transfer Active Morphs Script from DSON Support Script. I saved the outfit back into the P11 library then opened P12 and loaded G8F and the conforming outfit. I gave G8F a pose and the outfit became deformed but I copied the Joint Zones from G8F and this is the result.

So yes, clothing can be ported over and morphs applied to fit the model. Textures need to be addressed but if you have EZSkin 3 and Material Room knowledge, those won't be a problem.