You might be onto something there. TBH never been keen on these but may give it a go. Have seen there's a few styles available, some nicer than others.A Hamann style fog lamp surround cemented in place may also act as another line of defence and looks pretty cool to boot.
Nothing would give me more pleasure than seeing blood pouring from the open wounds! Shocking thing to say but necessary I feel, particularly as it's the car I bought my wife. Each time the car has been parked across the street from my house under a streetlamp! These guys really do have the guts to do this.Personally I would stick that carpet strip thing with the tacks to the underside of bumper so when they reach around it hopefully rips there veins in there arms and does away with them.
But on a more realistic scale, park the car in a well lit civilised area, maybe infront of a house window? Or sit in the car everynight and if they try to take anything run them over. I guarentee that would sort the problem lol