Lots of people use sulphur burning for waxmoth. I've used it for fumigation of chicken coops for redmite and it seems to work pretty well for that (though in summer I found redmite on the outside too which explains reinfestation).
I just have a couple of tablespoons of sulphur in a small metal dish resting on a heatproof (but not too heatsinking) surface, light it, close the doors and wait a couple of hours before airing thoroughly.
You could do the same with a hive, just make sure the low blue flame it produces is away from flammable bits!
Not much can survive having it's blood turned into sulphurous acid!
Sulphur powder (flowers of sulphur) can be bought cheaply from horse equipment sellers.