Ahh, got it out finally. I cut it into 3 pieces with a plier cutter. I was afraid the pressure might crack the ferrule, and while it creaked for a moment, it ended up unscathed, and I was able to cut it out cleanly. Now I just have to wait for the knot to arrive.
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That's great. If you have a digital micrometer you can get a good idea of what your options will be. The glue bump will be one issue. Some 0000 Steel Wool should allow you to clean up the inside without damaging the ferrule. The use of painters tape along the rim would not hurt either.
You can also decide what you would like to do for a handle. There a many, many options and approaches for that, but I would say dream and dream big. Get creative. Brass nuts and bolts, wooden handles, tool handles, drawer handles, other shaving brushes that are severely damaged, but still have good to excellent handles on the 'Bay, chess-board pieces, chunks of wood, etc.