XL,
I bent the right side (throttle side) towards the rear after hitting some ice in a turn at about 35 MPH last December.
I placed a little block of aluminum in the right-hand stop on the frame to prevent pinching any wires or cables in there, I secured it with some modeling clay.
The pipe was a 5' length of 3/4" schedule 40 galvanized steel pipe from a wide mouth clamp assembly borrowed from a neighbor.
The insert was cut from a steel tire iron, ground slightly to fit inside the handlebar. An insert made from 3/4" copper pipe fit between the cut tire iron and the galvanized pipe on the other end of the tire iron piece, just to take some slop out of the operation.
I held the bike and my son got out on the end of the steel pipe and pushed. We did it in small increments, bending slightly past the desired point to account for "spring". The end of the bar remained round, there's no difference in throttle operation and the handlebars are straight again.
It took a considerable anount of effort, the tire iron piece ended up with a little bend in it, the 3/4" pipe remained straight.
When you're done, you can use the pipe to confront the idiot who bumped your bike.
Good luck,
Norm