the only quick way is to duplicate the curves.., place them where they need be, and we are talking very small translations, .., and loft them. its a cheat of a way to bevel.

im not sure if its possible to bevel nurbs.., though one can bevel the curves straight from illustrator.., but it wouldnt surprise me if it was an action similar to what i just described.., a fancy loft or planar surface.