@renbymon this sounds similar to something I saw on hackaday a while back.
https://hackaday.com/2023/07/13/recreating-the-golden-era-of-cable-tv/
Not sure how close that is to what you're picturing, but it might have some useful bits you can adapt.
Hackaday · Recreating The Golden Era Of Cable TVFewer and fewer people have cable TV subscriptions these days, due to a combination of poor business practices by cable companies and the availability of alternatives to cable such as various strea…