Lots of stories on here about cars turning left in front of a bike or cutting them off and stopping short. If you wanna add your name to that list be my guest. My personal opinion on the matter shouldn't sway you away from doing what you want, just don't expect sympathy from us when you rear end a car
I personally think that reducing your braking power (on a bike that is arguably lacking in that department to begin with, no less) to save a little rotational weight is like cutting off your foot to help you run faster...
ETA you would be better off spending that money on a GSXR 1K front end if you really want to drop weight and improve performance, aftermarket wheels would do the trick too...