Awesome idea. Foulbrood has a distinctively nasty smell to it.
Though, for those new to beekeeping, Varroa mites are the most common and destructive problem facing US beekeepers right now, and hives infected with foulbrood are torched not treated (for hobbyists and non-pollinators, at least). The foulbrood spores are mighty resistant to treatment, and can be dormant for decades. If you keep an infected hive alive, you're treating with antibiotics permanently, and risk infecting the rest of your apiary by leaving the contaminated hive intact.
Nasty stuff, foulbrood.
Another menace to bees can be reduced....
I use MAQs just prior to the fall flow. They've worked well for me so far, and if there's any queen loss then I have a chance to requeen or combine before the weather turns.Regarding varroa I assume that you also use oxalic solution directly into the hive just before off-season?