Heres the answer to your fuel pump question.

You wire a switch in PARALLEL across the fuel pump, in effect shorting it. if anyone tries to start the engine without flipping the switch, it blows the fuse. Flipping the switch after that does nothing because the fuse is already blown.

No thief will check/replace fuses, but you should travel with a few spares, because you WILL trip yourself up with this eventually.

John C.