It is worth mentioning that a powder form of nerve agents was also created during the time that these things were the fad. Mirzayanov covered the functionality

It is worth mentioning that a powder form of nerve agents was also created during the time that these things were the fad. Mirzayanov covered the functionality of these binary powder based chems with 5-7x efficacy over VX. It would be highly unlikely for NK have functional quantities of these though. Edit: Also it would be possible to use a non-military Acetylcholinesterase inhibitor for this attack.