Are you aware of "The Cyclone" advertised in the two leading U.S. beekeeping magazines? It uses vaporized white vinegar.
Better Way Wax Melter
Honey Processors Ltd.
116 11th Street SE
Altoona, IA 50009
They claim in their ads that treatments do: "....an excellent job of killing Varroa and Tracheal mites instantly. It will suppress American and European Foulbrood. Nosema spores and chaldbrood fungus you can treat anytime and will not hurt bees."
Every now and then someone asks about the machine on one of these internet discussion groups.
If you have an interest, you could contact the above for more information (and probably a sales pitch).