First let's get it straight that the figure will be Uni-Mesh in its object state.  That is prior to import into Poser.  The Uni-Mesh that everyone is talking about is some mythical way for Poser to handle the mesh inside of the program that no one here is ever going to see.  The Mythical Uni-Mesh is something a small number of people have demanded over the years and to make Poser do that means a total rewrite of the program.  Which a side effect would be that all the old content won't work since it is no longer split.  What everyone really wants is a way to export the figure they imported and have it remain in the same order for the vertexes and faces that it came in with that way you could take it over to another program and work with it there then bring it back to Poser and not have it explode.  Also using the built in tools to smooth between body parts without spiking.  If it does those two things what do you care about how Poser does its thing inside teh program?

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13