Implementing it is trivial. you can just overlook the radio from openWRT and drown out every 2.4-2.5 gHz device in a 100M radius.

Doing it targeted is more difficult since it does frequency hopping, but you could probably reverse the frequency hopping algorithm to target specifically Bluetooth and force high packet loss.

This is still illegal for radio jamming reasons, and also patent infringement since a misbehaving Bluetooth device has not gotten permission to use Bluetooth patents held by SIG.