But then you have to re-rig clothing, hair, shoes, etc to dress the imported V8.1 if it initially imports correctly into Poser.  I think the OP wants to convert the figure through the established conventional means already established with DSON importation.  I'm sorry to say, she is too late coming into this process, and the necessary software to make this process work is no longer available from the source.  It's one headache to get V 8.1 to work in P11, it's another headache to export her into P12 intact.