Right now, I simply don't know.

The "geo-grafting" part should work, as it already does with the Genesis genitalia for example.

If the additional arms are a separate figure that just is conformed to Genesis with only the collars "geografted" on, then Poser "should" be able to do that. As I said, the genitals are a conformed figure with the pelvis part "geografted" to Genesis' pelvis.

But if Studio actually "injects" new bodyparts to the original Genesis rigging, then I doubt that figure works via DSON.

Of course the object file could always be imported into Poser and then custom rigged, if you really, really need that figure in Poser.

Best to ask this over at the DAZ forums in the DSON thread.