I think you are looking for Metarhizium anisopliae fungus. It was originally developed as a termite control and has been found to be effective against varroa and SHB with no effect on bees, queens, honey or humans. I recently tried to locate a source of M.anisopliae and was told that production as a termite control was discontinued by the manufacturer. Believe me, if its efficacy as a varroa control is proven there will be manufacturers
beating down your door to sell it to you.
Hopefully sooner rather than later for all our sakes.
If you're not confused you just don't know what's going on.