I had the same problem with the FREE RPi Zero W + Case + Adapter I have just received with my subscription to The MagPi.
Less than 5 minutes careful work with a hack-saw, and all is fine now.
(It was much easier than soldering the pin headers.
Thanks for posting the problem, and the solution(s). I had considered widening the hole in the case, which would have been much harder and less effective.
I will also be drilling a small hole in in the lid of the case, (just above the green led), so I can see when it is safe to power down following a "power off".