So it looks like ArchVision RPC works in IPR if Vray CPU rendering is set. But if GPU rendering is set, the RPC's don't appear in IPR, but do appear in Production Rendering with GPU.
Also, with GPU, I get errors in the log that the physical material is not recognized, but CPU rendering it must hide those errors at render time.
Also, with GPU, I get errors in the log that the physical material is not recognized, but CPU rendering it must hide those errors at render time.