Anyone have any advice on treating this?
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I would soak a couple of more times and then start to gently peel that off. Use water as hot as is still comfortable with lots of Epsom salt... or just regular kosher salt. Hopefully you can get the scab soft enough so it peels off. Once the first pot of water cools down... put him in a new nice hot one... hopefully after the third soak it will peel.
With that big of a plug... have stuff ready to pack the wound, and wrap it up after so it stays clean. Lots of blood = steady pressure for a full ten minutes.
I would keep him in a crate or other small and very clean place... probably for a week.
Soak and clean every day for a week so more infection can work it's way out.
After a week of that...it should be good to let heal up.