Good question! Probably not alot of options, but your idea is good. Another thought would be to turn 3/4 " section at muzzle down just smaller than flats diameter, and knurl a portion of the smaller diameter, then relieve the knurled section, fore and aft about .050", then chamfer the muzzle. I made a screw-in brake with a knurled section & it didn't look anywhere near as odd as it sounds.