If one implements structured quadrilateral meshes (i.e. where the order of the vertices within each subdivided coarse face is a regular grid going from left-to-right/down-to-up) it’s pretty trivial to convert the relaxed mesh into NURBS patches after the form finding stage. Here’s an old example of this workflow (about 20 seconds in):
Edit: Since this was originally part of my PhD studies I think I can share it. Here’s the subdivision and mapping components I wrote implemented into Daniel’s example above (baked brep on the right). Note that the NURBS patches don’t have great continuity with this method, but I imagine that could be implemented as well (maybe even using K2 goals):
201124_TensileExampleNurbsOutput_00.gh (26.8 KB)
201124_TensileExampleNurbsOutput_00.3dm (1.0 MB)