Don't know how much you paid for yours but I'm pretty sure I paid less then 20 bucks for the one I got. The hard part was finding a place that had or could get one. Ended up going to production tool I think. They did have ultra expencive versions then on down to the china one What the question is why the heck do they tap them with that ODD darn thread in the first place.
In any case most of us do it your selfers probably don't mind having a 1 use tool around
Also if you were realy desperate most of the ball nuts are steel or what ever and rather then screwing them to a plate you could simply weld a flange on them (something I considered) which would have been a lot easier then the screw in bracket. if I had to do it over again I'd weld a plate to the flat side of the ball nut and be done with it... Hopefully the heat of the weld would not effect the nut tollerance to much