Unpairing then RE-Pairing XR-11 with X1 Box

Sort of a part 2 of my other recent post about X1 Remotes... In experimenting with my Harmony 665 Universal Remote, I dug up my old AR Xsight learning remote and I'd like to "teach" it commands from my Xfinity XR-11. However, since it is paired with my Pace X1 DVR (PX022) it does not emit IR, it's now RF. So to teach the learning remote I need to (temporarily) disable the RF so it will send IR -- BUT once I learn the functions I want to revert back to RF. So I need to Unpair then Re-Pair it with the X1 DVR. How do I do this? Thanks!