Ant Lo-Jac is a great recovering system. I have a ring bolted into the garage floor and a 20 ton cable that loops the frame. No torches, cutoff tools in the garage. I have the garage blocked with either a truck or cars. The main thing is not to advertise you own the car. I know, you want to show it off. Well I have has friends of friends steal things over the years out of my garage. Motorcycles, blowers, race parts, and other things. I now have 2 dogs, one large and one small. They work great for night time. In the day I have good neighbors that watch each others homes. Not sure in your country but guns are still allowed. A new law in jersey now protects the thiefs from shooting them, well private property is just that. I have short and long range things in the home for protection. If you make things too hard they will burn the car in the garage. You can bet they will scope out what you have done to protect your property. Don't leave car in driveway without a cover on it. The rest of your ideas are good. I still like the claymore idea, if the guy is dumb enough to try and steal you car, he's ready to go to hell in a heartbeat.
Rick L. Ps most car are now getting stole by either towtrucks or trailer rigs that are sitting around the corner. They know what the car is worth and how easy it is to re title and paint.