Crazy foolish idea I had reading this thread and the raw.
Perhaps there could be a way Tsukune overrides that device and takes control of Alucard himself.
Tsukune fights hard against his opponents, and is getting pushed back as well as Moka, and they're getting desperate. Everyone else had been defeated but not killed (yet), and Moka and Tsukune are the only good guys left standing and being surrounded.
Tsukune is in a panic trying to find a way to save everyone and win, when he hears a voice talking to him in his head. This voice could be either Akasha speaking to him, or even an old sentient Alucard, offering him power... Enough power to destroy any opponent, devour them, and take their strength as his own, to conquer all who oppose him.
Then....
You can pretty much guess what happens from here on out...