With my limited understand of Genesis and Poser, I think that while you can put mesh and rigging of base Genesis into Poser (via cr2 exporter and Dsf Toolbox) you won’t get most of Genesis functionality, such as UV remaps, adaptive rigging, etc, because Poser simply has no ability to replicate those features. Transfer of morphs/shapes/scaling morphs, if possible at all, would probably take lots and lots of time. I doubt that basic transferred rigging for Genesis would be as good as what Genesis has in DS, so you’d probably have to basically reweightmap the whole figure and all clothes that you’d use for it.
If you need only clothes, not Genesis itself, it might be easier (and I use that term carefully) to refit them for V4/M4 using some external modeller to modify the clothes to fit M4/V4 and usual poser donor methods.You won’t be able to redistribute them but for your own purposes and renders it is ok. This method still requires you to know how to rig clothes for Poser and probably on using DS or DSF toolbox to export Genesis clothes from native Genesis format to objs.