Most nice cars are stolen by towing companies, they are the ones that have the "insurance company" towing contracts. They are the ones that the police always suggest to you after an accident.
Also they have yards with tall metal fences.
Park nose in and turn steering hard to one side and make sure steering wheen locks in place.
If you do that they have to get a dolley under the front wheels and that takes time.
A kill switch wil not stop a tow truck but making it hard to tow will.
Agreed that a tow is the most likely method. Wish the steering would lock in a '68.