If you just don’t like ads AppleTV works great.
That said if you’re set on something less locked down you might look into Dune-HD boxes. They have some that have a dual OS. One is Android TV (not sure how mod-able) the other is Linux that can have other kinds of apps. They’re virtualized and accessible without a reboot. They have great codec support. Just realize only some of their models have the Android TV dual system thing.
There is a certain smell of parallel construction. I hope his legal team is very thorough in examining every little detail, tearing apart time-lines of events, chains of custody, witnesses and find any holes at all in the public narrative if this is the case. One hopes that the parallel construction is in the way of they used illegal surveillance and intelligence capabilities to catch him and it could bring their whole case down, not in the way of they made up a claim that someone at McDonalds called the cops but really they were doing basic legal detective stuff tracking greyhound buses.