I had sterling silver grips made for a G380 and a G32 (each of which has only one grip screw per panel), but my silversmith was unable to duplicate the R9 grips due to the precision required to align the two screw holes in each grip panel. My friend uses the lost wax process for his molten metal casting. However, even using so-called "no-shrink" mold material, there was just enough shrinkage in the final silver castings to prevent the grips from fitting. We gave up after eight attempts.
Elsewhere on the Forum, there are reports and photographs of work in progress for casting after-market carbon fiber grips. I don't know what mold process is being used in that project. As far as silver is concerned, though, I think that CNC machining might be the only answer for a pair of R9 grips.