Relating to the fire protection stuff. In aviation we use little pressurized fire bottles that have little ends with some simple solder on them. So when there is a fire the end melts and out goes the fire.
Im trying to look for such a device thats also cost effective, for both your needs and mine ill update you if i find something. Im aiming at $60 or less.
I would also suggest a combo smoke detector and carbon monoxide detector for that room, or cabinet. Its a cheap, and easy to find saftey solution.