going to be forced into finding a replacement switch and soldering. 
There must be at least one key you can live without, e.g. scroll lock or one of the function keys. You could swap the switches across.
Assuming the fault is with the switch (and not a bad solder joint or controller failure) you could try opening the affected switch and see if you can correct the fault, but as a note, they're hard to open and even harder to reassemble.
