I always thought the best way to keep a thief from stealing your car is to leave the key in the ignition. Or even better, the key in the ignition and the window down.
There's no challenge there.
If you really want to get your car stolen, use a club. Those make the thief laugh. "Look at that, this guy thinks he can stop me with a club. I'll show him!" I would never use a club.
So don't worry about it. Consider it theft protection.
I have a car that has never had the key out of the ignition. The previous owner told me that if I ever took it out, I'd better have at least a half hour to get it back in.
Secondly, if a thief decides to joy ride your car, you wont have to replace all the stuff he breaks when he slide hammers your ignition switch.