How different are 1050/1000 frames and engines? This is how the Denali bracket fits. If not compatible, fabbing one to suit should be straightforward, just one bend on the oem mount.
I have a soundbomb on the KTM. Took it for it's mot a couple of weeks ago. "Try the horn" said the tester, usually a man of few words. I winced and gingerly pushed the button. F**k me, that's loud!" was his considered opinion.