Keep it real simple and just run the line out from your TV (analog) to your Moment analog input. Then use either the Moment remote or get a BeoRemote One to control it. If you have some extra funds you could get the RCV3000 to the transmitter 1 and use your TV remote to control the transmitter 1 direct when using the TV. Once you run an optical or analog input.
Indeed that's something I thought about. But what if the RCA cable is about 13m long. Wouldn't that downgrade the analog signal too much? I'm not an expert, just thinking about it.
BTW ... I bought the Transmitter 1 second-hand and luckily the RCV3000 was included.
I wouldn't worry about the degraduation of signal coming from a 3rd party TV RCA output. It's most likely not top-notch to begin with to which the length of cable won't really matter. If you want the purest audio from your setup use optical. Otherwise connect the RCA and just enjoy it. You probably won't even know the difference in casual listening.