Quote - So then, a sphere-rigged Dev rig would be needed for compatability for those making content in Poser, and then the item could be brought in and the WM rig added in Studio...

 

It would seem best, imho, to rig at the lowest common denominator and then take it into your software package of choice and WM it.  But that still seems like a lot of extra work just to support two versions of one figure.