Ozone can be helpful with odors. I doubt that it would do much for dander or other allergens.
Enzymes could work, in theory, but I have not seen any that do much for allergens in actual practice.
One approach that has not been mentioned is to denature the proteins in the allergens. That is what the Masterblend Responsible Care anti-allergen products do. There are products for use in HWE or post cleaning products.
Very interesting, Scott. I'm going to have to look into those products a little closer. Good to know.