It sucks to have to destroy something... you could also for only a few bucks just buy a female connector plug and get a foot of 14 gauge wire. Plug the pump into the connector, and attach your bare wire from the connector to the switch and your neutral and ground. This way you at least have the option in the future of using it plugged.
a better idea:
You need to mount the switches to something, so why not build a small box that you can put the switches on (just light switches will do) and also have two regular outlets. Plug one pump into one outlet, and wire the other pump's wire to a male plug, then plug it in the same way.
If you don't want to cut neat holes, go dirty and just cover it with wall plates. All these things are really cheap at most local hardware stores.