Considering people have been doing it for years
Over the years, I havent seen any in person myself, and yours is one of the first Ive seen online, not that I was looking real hard.
With S&W taking the time to make a prototype 942, I doubt they would have if it wasn't possible (it wasn't continued since Wiley Clapp tested it and said that people would not buy it; don't know if it was the idea behind a 9mm J-frame or the recoil... but neither are a negative in my situation).
As best as I can find, that "one" prototype was back in '99, and I havent seen anything since or recently. Are they talking it again?
I always assumed that they were having troubles with getting the steel 940's to work, and gave up on the idea. The two I had, both had the same serial number, but it was obvious that the second gun they sent me, was a different gun (by its markings), and not the one Id sent back for repair. The second time I sent it back, I told them didnt want it back in 9mm, and to replace it with a .38, which they did.
I never found the 940's (while they lasted) to be inaccurate, but they were specific built for 9mm. Something pointed out by the boy over on THR about using 940 cylinders in place of reamed out .38 cylinders. His experience anyway.
Recoil of my 940's, while brisk, and similar to my Model 60's in 357Mag, I really dont think it was much, if any worse than an Airweight with +P .38's. Not sure what I would think of the 9mm in an Airweight. Probably not much, as Im not a masochist.
also, remember those pressures are maximum
Those are the SAAMI "standard" pressures for those two calibers. Now maybe if you went with a 357 as a host, it might be a better option, as 357MAG and 9mm are both 35,000 psi calibers.
It would be interesting to see how long an Airweight would hold up to "constant" 9mm use. I have two 642's, one of which has a good amount of "warm" reloads and factory +P through it now, and its not near as tight as it was when I started to use it, about 15 years ago now.
While I was still carrying it, it got shot pretty much weekly, a hundred rounds or so. These days, its usually only fifty to a hundred rounds a month, just to stay on top of them, and my hand isnt real happy with me for a day or two after a box of 50 either.