I don't want to destroy my Les Paul by drilling any holes into it. I've seen someone create a kill switch that you can take off anytime but I don't know how to use a soldering iron. I also do not want to use the toggle since I've heard it destroys the wires that connects it to the neck and bridge.
If your guitar has two pickups and a volume knob for each of them you can put the one pickup on 10 and the other one on 0 and use your pickup selector switch as a kill switch.
That is in fact how Tom Morello used a kill switch for many years before he got his custom made guitars.
Just note that if you do this and you use your pickup selector switch as a kill switch you are probably going to wear that pickup switch out many times.
You mention wanting to use a Les Paul but make sure it is not a guitar that should be kept mint. That pickup selector switch probably never built for the vigorous switching that a kill switch has to endure.
So just make sure you do this on a guitar that can have switches replaced.
This question reminds me of a project called the Scrub Board by Jeremy Bell.
I'm not sure what state it's in, but half of the project was a home-made "rocker" to cut audio signals in and out. Made from a couple of coins and a rocking piece of foil. There are videos of him using it with his guitar (as well as looping and delay effects).
If you could get a kit, or construct one of your own, that would create the effect you want.
(Again, I'm not sure if this is something you could easily do at the moment.)