I've also looked into disabling the buzzer, and feel your pain. As you stated the dealership CAN disable just the buzzer, and the warning LIGHT will still be there...which would be a good compromise...not 'endangering' anyone, but still getting that annoying sound out of your head.

Dealership won't do it, however for liability reasons, but maybe some techie on these forums can decipher the manuals and let us know how to disable the buzzer.