All of these solutions are very high tech, compared to the technical vintage of the car itself, i.e. 1950’s technology. And all of them just make life more difficult for the owner, not the guy trying to steal your car (and in the 20 years that I’ve been on this forum, two cars were stolen from a lot at Vintage Speedsters and none from a private owner - None.)
First of all, how many Porsche 356 or replicas are there in your locale? If one was stolen, how long would it go un-noticed? Like a couple of hours? I’m in central Massachusetts. There are four 356s in my town and we all know each other and all of the local cops know our cars, too. One of our cars goes missing and everyone’s gonna know.
But all that’s beside the point. You really want to prevent your car from being stolen? Easy-Peasy……. Open the engine cover, pop off the distributor cap, remove the rotor, put it in your pocket, replace the cap, close the cover. That all takes less than a minute and that car ain’t going no where until you replace the rotor.