Well, personally, I've plum lost count of just how many 914's I've stolen in my modest little career. No one ever seems to hear me leaving the driveway, no one ever follows the oil trail back to my house, and as a 'hot' vehicle, I find I can just blend in with the economy car crowd so well that I've got no fears about driving my new 914 the very next day, to work.
Anyway, if you really don't mind having to replace that ignition, the old dent puller method works real well. 'Rake' out a unit with that, and any old slot screwdriver with a leather fob becomes your cool new key.
John