I've just tried this repair. All seemed to go well enough, but I found it quite difficult to remove the faulty switch (in my case it was the left one, which had become insensitive / sporadically unresponsive), and I was concerned I had put too much heat into the PCB. Still, soldering the new switch appeared to go well, so I reassembled. Unfortunately the left button now makes a nice click, but doesn't actually do anything. The right click is fine, as it was before. Slightly frustrating.