Perhaps call Nick, and he can do a "P & d" ??
Or, maybe he could do a shop relo. You have any facilities nearby, like next door, or maybe even on your property???
I live in NE Phoenix and have met numerous GN owners in the 8 months that I have owned mine. There are enough cars that local sources have been developed for almost anything. I am an itinerant tinkerer and therefore I will try to solve all of my problems by myself. I suggest that you contact Nick and identify your concerns and ASK for his help in outsourcing the work. He has more than enough to do and I am assurred that he would extend this courtesy without hesitation.
I live in Mesa and I go to ArizonaGn, even if I have to push it. The shops think they know about Turbo Buicks, but they only know what they read in their shop manuals.