This wouldn't be that hard to rig up, though it would mess with the lines of the bike:
https://www.youtube.com/watch?feature=player_embedded&v=eEqqvoSD2P0
https://www.youtube.com/watch?feature=player_embedded&v=eEqqvoSD2P0
+1 !! I bought mine from Aerostich, mounted of course in the fairing. I promise, it is loud enough to make the guy driving an 18 wheeler flinch!! The Aerostich folks call it the "Ear Cannon." But, it is the same Stebel horn. One of the great "anti-cage" devices you can add.twkBMW said: