I mention radiodroid elsewhere here: it has a sleep timer that defaults to the last one set, so you would have to tap first to start the app, then 2nd to start

I mention radiodroid elsewhere here: it has a sleep timer that defaults to the last one set, so you would have to tap first to start the app, then 2nd to start a station (at the top of your favorites), then the timer and ok, so that is 4 taps I guess. Edit: and it seems, an alarm clock.