Is it possible to scruff Peanut Butter? If so, this is what I'd try. Have hubby get as much neck skin as possible in his "strong" hand and then grab his hind legs in the other. Stretch out upside down while you give the meds. it might work.
2nd thought would be to ask the vet if there is any pharmacy who could compound the medicine into a cream. the cream is rubbed into the ear...no trauma.