Well, that's going to be the service pattern for the Q express when the south side bridge tracks reopen, so that combination will see a revival.
Now, if you change the route sign to N-Broadway Exp and leave the 57th St. sign in green, that's exactly what I saw on that very first N train I ever rode on all those years ago. "Coney Island" backlit in green was even better.
And speaking of the R-27/30s, they got new front end route curtains when the Chrystie St. connector opened, but kept their original side route curtains for the most part. Next time you watch The Warriors, pay attention to the route sign in the prom couple sequence when the train is running underground. It's set to "QB-Local via Bridge". The movie came out in 1979.