Yes, Steve you can substitute a threaded mag release and steel button from a single stack 9mm.

You don't need to drill the frame for the spring and plunger.

Use the "tornado" spring from the CS9 (instead of the spring and plunger), install the new parts, adjust the button/nut to your preferred height, and, as you say, carefully put a very small drop of a wicking loc-tite on the center of the nut.

While it is possible to do this, I've never had a bit of a problem with the plastic button/nut on any of my CS models.

John