No I've had no luck using RPC's with Maxwell, unless there is a way to either convert the RPC material to a Maxwell material or have Maxwell accept materials other than Maxwell materials I don't see how they will ever work.
I never use RPC's in the scene anyway. Either use the photoshop RPC plugin, or render them with scanline (this is what I do) and composite them after. Much easier and less risky considering how unreliable they are. You can use a matte shadow material to get your reflections also.