It can be done. I'm doing it now. It's not cheap, though, as the FiOS router is actually 3+ devices in one: a MoCA adapter for the uplink on channel C, a MoCA adapter providing networking to the cable boxes on one of the D channels, and a regular wireless router. In order to remove it without plugging into the RJ-45 port on your ONT, you'll need all three parts. Additionally, the ch. C uplink is encrypted, so you need to grab the encryption key from the router (available buried somewhere in the web interface). I picked up a Netgear MCAB1001 kit and it's working quite well.