Yes, I know, permanently fit a loaded UZI behind the grille and when the star leaves the radiator shell : voilĂ !!!!

OK, seriously, I am going to fit an alarm.
Now time for a tiny french lesson guys

You know, the kind of alarm that honks at the "son of a whore" (french slang : fils de pute) that tries to pull it.
I am quite unfamiliar with alarms. Do I need a microswitch ? or is there some kind of "touch sensitive" device ? I understand that vibration detection is a contactor that closes when there is some lateral motion but that does not sound like an early warning since it seems that quiet a bit of motion is needed.
If the alarm could "beep" at the fils de pute, he might leave it at that.
My Portuguese neighbour seriously thinks that a load of salt in the ass from a 20 gauge is the best solution but french law prohibits that - we are not in the hills of Portugal, unfortunately

I am actually trying to do two things : warn the "sons of a whore" while provoking the least inconvenience to my neighbours, so no full blown circus at first...
Suggestions other than rehabilitating the guillotine ?
Denis
Paris, France