I ran into this situation at our store. We had an old MX-3000, MRF-350 setup before we went to RTI. We decided to put the URC in our secondary show room and show RTI out front. Our distributed audio equipment is in the rack of the secondary room but I wanted to be able to control all zones from our main room T4. I ran a Cat5 between the room (50-60 feet) and connected the MRF-350 to the IR output of an RP-6. It works great and saved the business a little cash on demo product. You do loose the IR port mapping, but we didn't have any conflicting codes. I did have to mess with the output levels from the MRF-350 to get strong enough output on the flashers but other than that it works well.