It's crazy...but it just might work!

[Flangepart]

No really...this stuff looks...kinda cool!

http://www.buzzfeed.com/alannaokun/tricks-to-vastly-improve-your-car#4i5twc7

[Josso]

11. Rig up a screwdriver-key to make it look like you've stolen your own car.

I can foresee this going badly wrong 

Sir I'm gonna have to ask you to step out of the car

If you really want your car to be unjackable It's a lot easier to hide a switch (in the glovebox for example) that just disables a fuse or whatever. The parts are next to nothing and there are plenty of DIY guides online