I'm just south of Sioux Falls. If he's headed a little further south, have him give me a hollar! In any case though, best of luck, and I hope fortune smiles on him!!
I'm afraid that your fate is sealed. You will probably have to replace the evaporator core. I have done this, takes time, but be patient, take your time, and it can be done.
I used Genisys, but only to see my TDCO. I used KOKO procedure to learn, and then adjusted the pump to what I wanted. Otherwise, genisys cannot help us.
As far as stainless goes, I always thought that it was harder, therfore tougher thread engagement. Brass seals beautifully, so I was just assuming. But you know what assuming does!