I unfortunately had the experience of saying goodbye to my Midnite today. I share in your grief, and if it helps, it sounds as though Benji had a devoted parent and I am sure appreciated everything you did for him.
Hi, i dont know how much help it would be, but our vet had given us a pen that had a soft applicator to administer the prednisone to the bare flesh of Midnite's ear. I hope Salem is doing better and wish you and your kitties well.