I don't blame you for wanting to keep it simple. For many folks, a rotor is the best of several imperfect choices. A few people install an antenna / rotor for each set.
I am currently building out a multiple antenna install that uses a network attached tuner.
http://forum.tvfool.com/showthread.php?t=820 This is certainly moving away from the 'KISS' principle though.
Back to your original question; If you find a passive band-stop filter tuned for channel 19, it will block both analog and digital.