Jebus just buy handlebars the correct size. Trust me on this -- the amount of time and effort required to get the ones you have to fit will far outweigh just spending some $ on the right ones! Quit while you're ahead!
I'd also be somewhat worried about the decrease in bar strength from thinning the walls.
You couldn't hear a dump truck driving through a nitro glycerin plant!
Badasses might screw with another badass. Nobody screws with a nut job.