Like I said, he is yours to decide what to do. I am not judging.

For the foot, I was recently told of a sugar and betadine paste to apply that draws the infection out. You mix the two ingredients into a pasty consistency, slather on the foot, wrap it, and then change every couple of days. If there is a wound, I wrap with a gauze pad with a generous amount of Neosporin, then use vet wrap and cutting it into about 1/2-3/4" strips, wrap the foot so the gauze in no longer exposed. The vet wrap adheres to itself so no sticky tape is needed. It comes in pretty colors too! Change every couple of days if you go that route too.
What did you give him for antibiotics? Pen G? I am not sure which one would be right for bumblefoot since it is a staph type infection. I am sure there are 500 posts on here about bumblefoot though.
If you want to try a more hollistic remedy too, there is Dr. Harvey's Organic Healing Cream, but you need to order that online.