the switches are pretty straightforward to swap out, fwiw. fairly large and reasonably spaced pins to solder compared to any other mouse hardware. tbh the disassembly and reassembly of my g604 to get to them was more effort than replacing the switches themselves.
most logitech mice use the same switches, any Japanese Omron switches will work (avoid the Chinese Omrons). here’s an amazon link to a 2-pack. there’s also a bunch of other switch types nearly as varied as keyboard switches, these are what I put in my mouse, but if you’re just looking to stop the double-clicking the Japanese Omrons are the way to go.