I would not want to try to straighten it by bending it back. Instead I would want to re round the kinked area. FWIW, I would drill out an appropriate hex nut to the tubing OD and cut the nut in two thru opposing points. Then file/round/polish all sharp edges that would touch the tube. Then Id clamp it around the tube with Vise Grips, squeezing and re orienting it a little at a time to make the cross section as round as possible again. The bend would straighten somewhat while doing this. :confused3:
larry