JF asks
"Any here actually KNOW if you could put effective fire supressant technology into a hugh drafty space like the nimrod bomb bay and what it would take?"
Well, yes. It is. Much larger volumes such as the insides of flour mills (i.e. buildings) are routinely protected against dust explosions by such systems.
Typically will detect an explosion shortly after ignition occurs.It will then discharge an agent to extinguish the explosion flame, typically using a detonator to release Halon or inert powder although pressurised water can also be used. You would need several detectors to ensure that you could see the explosion starting and lots of extinguishers to get the extinguishant to the right places in the right time.