Is it possible to put an outboard finder on a Bronica SQ-Ai or ETRSi (I'd like a GS-1 but fear that they're quickly becoming very rare and probably pricey)? A motorized one of these might be good, though I'd like to leave the mirror locked up and view through an outboard finder (maybe use my Voigtlander 50mm brightframe finder, heh) ?

Actually the Littman looks fantastic but way out the the price range for this project