|Tightening the chuck on a drill press|
How about we make a socket in the drill body to hold the key, and make the switch dependent on the chuck key being in that socket before the drill will operate? Solves both problems. Requires some space in the drill and a fancier switch but it would solve the problem of the missing chuck key that has plagued machinists and carpenters since before there was electricity.
Yes, I know, many hand-held drills use keyless chucks these days, but those are only good for light duty jobs. If you need to drill a real hole, you need a real chuck, one that uses a key.