UT,
You are going to way to much trouble. Just get the stuff and make and install an alarm unit that creates a field around the whole car. Range can be adjust as to what the unit does. Say anyone getting within 6 feet of the car enters the covered range. A very good deterent and funny one to watch is having a very loud recorded scream "Stay away from me." Next best is the 5-4-3-2-1 very loud followed by violent explosion. Of course you will be responsible for the mess. These proximity alarms work well on a roadster but not so well on an enclosed car.
Ron
