Is there a plug in that would allow you to convert poly to nurbs w/out going from subD to Nurbs?

when I go from subD to nurbs, it gives me all these crazy parameterizations and is a nightmare to to rebuild the surfaces evenly. I gave up. So any plugins to convert or anythying that will make it easier to do so? I also tried doing maya live and building nurbs curves on the nurbs model, but that only allows me to make one patch of the model live...........