I found several mites in the enclosure while changing Nim's water today. Tomorrow I'll soak the enclosure in warm enough water to wipe out the ones not directly on Nim. I'll also move the enclosure to hardwood floor to make cleaning the area around it easier. Killing any mites on Nim's head seems like the biggest challenge here. If getting natural chemistry reptile spray on his head would do it, I'd go for that.

Otherwise Afoxolaner looks interesting. I'm sure I could follow the methodology of that paper. I'd need to cut the tablet down to like 1/20th of its size (exact number pending weight of snake.) My only concern is in that study they just used the same dosage per kg that's given to dogs. This suggests we don't really know what the minimum effective dose is for snakes. I will look for more papers on the topic though.