Agreed that you're way overthinking this: Just empty the bio media into a bucket of clean tank water and put an airstone on it until you're ready to set-up again. Honestly, the airstone's probably not necessary either.
What you don't want to happen is for a nasty canister full of sludge to go anaerobic (because there's no oxygenated water running through it).
Matt
What you don't want to happen is for a nasty canister full of sludge to go anaerobic (because there's no oxygenated water running through it).
Matt