even without hotswappable switches there's a good chance you'd be able to replace the switch anyway
if cleaning it doesn't work, you should be able to look up how to desolder and then replace the switch yourself. you should only need a cheap soldering iron, some wick, some solder, and a new switch.
as long as it's easy to physically get the keyboard apart, the switches should be just about the easiest thing to solder there is