All the household switch parts cost about $4. The servo was just one I had lying around. I'm sure a $12 servo would do the trick.
Next, I did a little research on G-Code, knowing the commands were already standardized. It turns out M03 is the standard command for "Turn Clockwise" and M05 is the standard for "Stop Turning". I updated my firmware and added a servo library. Here it is installed:
I am happy with the result. I did a quick search on thingiverse to see if others have done this and found a much more elegant solution: Servo Controlled Switch by oomlout