Brian, are you sure? I seem to remember from when I was using Carrara 5 pro (the original eovia version) that it could use Rhino 3.0 format meshes. I'm sure I remember that ... at least, I think. If you're using 5 pro- could you check? I don't think Daz 3d retained that feature though. I may reinstall it myself to check since it's bugging me that I'm not sure.

P.S. if someone's got Amapi floating around, I definitely remember Amapi could easily do that and it reads (and writes I think) Rhino 3.0 nurbs as well. I'm not sure of the first version that had that feature though, but I know 7 did. I'll see if the free version, I think 5.1, is still around, and check if it has that feature.