OBD thieves seem to operate without flatbed trucks to save time and money. They drive the car off the drive yard as soon as the false key is operational.
So got to think of mechanical devices to impede or make it more difficult to drive the car (as long as you do not forget to remove these security devices before you drive your car...).
Do small wheel locks exist as the ones you often see on motorcycles ? Or are these types of wheel locks simply too weak on cars ? At least it can surprise thieves (and make them dash off) as soon as they notice that they can't push the car off the drive yard.
...there still exists the desperado option