Can you cut bike grips?
but yes, you can cut bmx grips. they even make bmx grips that are made to be cut down to whatever size you want.
How do you remove glued grips?
U.S.A. You can put a towel or something around the grip to help insulate it, then activate the heated grips, and then gently twist it after they warm up. This will sometimes heat the glue enough to allow you to move or remove the grip.