Re: Electronic Keys Unsafe? Guess What, so are Mechanical Keys!
"I've got a rfid token sewn into my glove, and a latching relay setup."
In the old days (before immobilisers) people would have hidden switches controlling the ignition or fuel pumps. These worked relatively well until thieves started working out that they existed and looking for them (there are only so many places you can put a hidden switch and still have it reachable from the driver's seat.)
My modification on this theme was a monostable timer driving a relay which shunted the ignition controller (aftermarket TAI fitted) on a 15 seconds on 30 seconds off cycle. The only time someone managed to steal the car (using a key they'd stolen from inside the house), we found it a few dozen yards down the road. It seems thieves don't like "unreliable" cars.