You can, but it's better if you just slide your brakes/shifters/grips in bound 1/2".
If you have riser bars and don't have the room, you can simply use a razor blade or sharp knife to cut them. Most grips now have a guide line in the pattern to use.
Personally, I'd just slide stuff over, shove the bar-end on and be done with it!
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"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
"Your Bike Sucks" - Sky Yaeger