(First post)
Intro: Software engineer by day, shop rat (wood, metal, machines, etc.) by night. I build and maintain all my own rides, and I don't own any newer than me.
I have an answer for the liquid latex longevity issue. Permatex Right Stuff gasket maker.
It is used to seal engines where you have to deal with lots of chemicals, vibration, heat, time, pressure, and on and on and on. In the muscle car world, this is the preferred way to seal an intake manifold on a performance-oriented V8. Ditch the factory end seals, and lay a bunch of this stuff down. Seriously heavy duty stuff. It sticks very well to ABS (the material the switch housings are made of), but does NOT stick well to the stem material (fortunately/unfortunately). When cured, it feels very much like silicon, but they call it "elastomeric 'formed-in-place' material".
In my initial test, I applied a small amount on a single switch with an eyeglass screwdriver. This worked very well. In a subsequent test, I applied a crap load with the same screwdriver, allowed it to fully cure, then trimmed away the excess (seems more repeatable and less monotonous over ~100 keys). In the latter case I left a much heavier amount, and the result was complete silence on the upstroke. A properly mounted red/black with this, o-rings, stickers, and a little grease will be absolutely completely silent without qualification.
You can get it at any FLAPS (Friendly Local Auto Parts Store). I'm not sure what sizes it comes in, but I get the size pictured and it runs about $20 a tube. You definitely won't use all of it, but it can get pretty messy and there will be quite a bit of waste. It's not especially smelly, but it's super messy. If it gets on anything but an absolutely smooth surface, it's permanent. It can be permanent on smooth surfaces as well if not wiped up immediately. It's nasty stuff in that regard. Wear properly fitting gloves and disposable clothing.
There are other types of gasket maker available with different qualities. I imagine there are harder and softer varieties (different feels). Save the ultra-high temp stuff for exhausts though (I believe it contains copper, and thus presents some potential concerns), this is the only stuff I really use in the shop. Of all the varieties I've used though, this is the most hard core and least likely to let go.