I also use the CM15A to convert my floodlights PLC to RF (on a different unit code). The set-up works great!
Before I bought into AHP I had a rather crude mod I used to turn on my VCR commander. I simply cut the (battery) power line on a remote, ran the cut line so a universal module would complete the circuit, then fixed the desired RF remote button down. The floodlights triggered the universal module, which completed the battery power on the remote. It worked.