Alas, no. You couldn't disable Bluetooth completely. As soon as it "woke up" from any "sleep", Bluetooth would always reenable itself even though I always had the optic fibre cable plugged in.

Probably the only thing I could have done was cover it in aluminum foil. I thought about just opening it up and tearing out the antenna, but the casing was an injection molded piece with integrated clips. It would break on opening and not be possible to put back together.