Gotcha. I already measured the outside diameter as 16mm, and am going to optimistically eyeball the threading as 1.00. I've contacted the actual manufacturer of that switch I posted in the amazon link, and they're gonna send me two samples for testing. Gonna advertise the crap outta it if they work.
If you'll note the wiring on that switch, it's wound up quite a bit. My plan is to have it twisted to counter the screw direction a few times. I think that's how these are supposed to be fitted, but wish me luck.
Also, as a note, I confirmed with a sales rep that the stainless steel switches are 316L.