Fords is pretty good. S&W *may* work on it, but you would have to call and ask. I got different answers from S&W. They worked on my 1953 K22 a few years back. I'm not sure if the gun is worth refinishing, but if you are sure you want to, then Fords does good work. A nickel plate would be interesting, if done by a professional like Ford's. Of course the rear sight would have to remain black, and on those older guns, the front sight was black too.
FWIW, a 1946 K22 would be a post war transitional, meaning it has one line address, low K prefix SN, large "beehive" ejector rod head. The gun also probably has the narrow rib with a tapered barrel. That was later changed to a wide rib, and heavy non-tapered barrel.