Carol! The black keys! Wow! Have you tried my (inspired by Uncle Jaque) experiment of shooting your instrument? If you have any NYC cop friends they may be able to help, espciallty if you ask them to shoot the black keys!
You can get them to perform the expeiment by shouting, "Look out! He's got a wallet!" Make sure there is a heavy object to hide behind as you do so because of ricochets... then let us know if it works better than a capo on you accordian for changing the key...
Larry
Maybe someone will try this on bodhran also...