If you're interested in using sulfur, here's an article that you might find useful: https://entomologytoday.org/2016/07/18/battling-chicken-mites-with-bags-of-brimstone/ - my mite problem didn't spring up again, or I was ready to invest in some sulfur myself.
Pretty much confirms what my pest guy suggested for getting rid of them inside the house - misting rubbing alcohol on surfaces you can't easily clean (i.e. mattress), and running affected clothing/bedding through a hot wash and hot dry (not quite the same as steaming, but raises the temperature...