MIMF

I build guitars and ukes. I have been forbidden to continue my practice of applying Nitrocellulose lacquer (wife has concerns).

Sorry, Stephen, solicitation is one of the few things we prohibit here. Please reacquaint yourself with the Forum Rules.

Hi Stephen,
Ask your question on the "official luthiers forum". I believe several people there send stuff out for finishing and can recommend finishers that accept musical instruments.

Better yet, learn to use varnishes. Apply with a brush, rub it on, or spray it on. There are several types and methods of application, and with some practice you can have world class finishes.

There is also water based "lacquer" that continues to be developed and improved, though I have yet to find anyone who uses it that is really happy with it. YMMV

How attached are you to this particular wife? Just saying....

Agree with Michael with the exception of his comment on water based finishes. There are good non-toxic finishes you can use, shellac (french polish), True oil, and the water based "lacquers". I have been using LMIIs KTM-9, brushing it on, and have been satisfied with the results. One luthier at a festival where I displayed my guitars thought it was Nitro.
Steve

Start getting used to the idea that nitrocellulose lacquer's days are numbered. We have new finishes popping up all the time around here and some of them show promise
I'm sure a google search for custom guitar refinishing will yield results but I'd recommend finding someone local to work with. Shipping and insurance get very expensive.
If you are truly committed to nitro then get the equipment you need to apply it safely. You can cobble together a supplied air system or pick up a used one to spray outdoors.