Finally tried the Coke trick, and it didn't make much impression. It sat down the barrel for seventeen hours (!) and in the end, the obstruction remains as hard as ever. I'm starting to wonder if it's time to admit defeat and get the thing to a gunsmith, though that would feel like a defeat.
OTOH, I could simply dry the barrel out as far as possible and then go back to trying to break it up. I think exposure to any sort of moisture is encouraging that powdery stuff to congeal into a hard-to-break mass; perhaps removing as much moisture as I can would help reduce it to its more powdery form.
Meredydd
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