So yeah... I'd go with what some other people are saying, but do it like this:
Go to a key place, get an ignition blank from an older (70s/80s) Ford product cut to your key. Even though you can't start the car with it (if ya have PATS), you can still get in... plus it fits in your wallet. If you don't have PATS, then you always have a key on you.
