It really depends on the viscosity you are looking for. I personal like roughly a 65% grease, 35% oil mixture for tactile switches, but I prefer a little bit thicker of a lube for them YMMV. I think @Manofinterests advice is the way to go if you are not sure what you’ll like yet.
Edit: BTW just shaking it for mixing to see how it end up is fine, but you want to mix it a bit more thoroughly for actual application IME. I would shake & vigorously stir it with something when preparing it for application. 