I have tried this with a dlink DXN-220 and it does work. Set to ALL-PASS and SCAN (probably could just set to 1000 MHz). I did not try diplexer. The Actiontec died, but luckily I had saved the MOCA WAN key before it did.
Thanks. I'll update the FAQ accordingly. -- There are 10 kinds of people in the world; those who understand binary and those who don't.