It could broadcast I'm a stolen bike with cords with the electrical pathway to the transmitter being also wired to something else more vital.

You could pass an encoded unique to device signal over the rest of the system with chips elsewhere expecting that signal and noping out if they don't get it to foil rewiring.

You could require a periodic modifier received over the air encoded in chip2 .. chip n but not available in chip 1 like a series of codes for your key fob to unlock your car.

You could absolutely make it as hard to defeat as defusing a bomb and lunatics who wave glass bottles are no longer stealing your bikes.

This has got to be 90% of the problem.