I already mentioned burnside jack, and I'll stand by that name. But, I've been reading this old dime store western novel about a man hired by a railroad contractor to clean up a railroad town (think Hell on Wheels for setting and theme). The other characters in the book refer to this man and his own brand of justice and law as a "high hander," on account of his rough and tumble, yet tough as stone ways. It made me think of your challenge. So how about The High Hander Jack?