In the mainframe days we put in place a delay before another attempt that exponentially grew each time the password was entered incorrectly. First fail - 2 seconds delay, Second fail - 4 seconds delay, Third fail - 8 seconds...etc

Try the Interior light extender. Fun, simple and actually useful, I used it for years on my older cars (Modern ones tend to have one already). You don`t need the PCB, the 2N3055 is robust enough in the TO3 package to mount the other components directly on the transistor (Or use a breadboard). Wrap it in electrical tape, connect it to the door switch and leave it in the kick panel. This one is funky as other types of this actually draw power when not in use, this one does not due to the discharging cap. http://cdselectronics.com/Kits/light_ext.htm