Kind of a moot point but i wounder if a fella could us a regular tap like a thread file. Attach a flat bastard to the tap some how ( mechanics wire) tape the non handle end for another handle and go to town. Probable take forever but if the nut was unabtainable it just might work. Dont know haw bad you ganked up the nut. You have some tappomatc edge cream around? That stuff is great for easing into ganked up threads. Plumbers use it for tapping pipes.