Naaah, a device that constantly tries to connect to any nearby Bluetooth devices and constantly changes its own Mac address so it can never be blocked.
I hear you. On our BestRev v1.1 we will use a 5.4 Bluetooth chip to make better use of its sleep state. And we'll change the functionality to try to connect to any nearby devices, wait 10 secs for devices to respond then change Mac address and go into sleep state for a user configurable lapse of time and repeat until power failure. I believe that will give us around a year of revenge. Depending on amount of available devices, configured sleep time and battery selection.
On an unrelated note, I've been wondering how hard it would be to swap out the sound file for a screaming goat and time it to go off at a random time every night
I had one with a cricket chirp sound that I hid behind a friend's glove box. Watching the downward spiral as the weeks went on was hilarious but also made me feel incredibly guilty.
For the right person, a Discord alert sound might be better. On the other hand, the sound coming from somewhere other than a device that can access it might clue the victim in a lot sooner.
Alternative: The AOL "you've got mail" sound. If you're going to have something come from the aether, that one could have them thinking there's an old computer in the walls somewhere.