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Well, September marks my true 1 year anniversary with the EGG, so I decided to give this a try. I was surprised at how little ash really had accumulated between the shell and the fire pit, but the holes definitely had some substantial clogging. There was also some buildup of drippings on the walls of the fire ring, also.
After removing the fire rings from the EGG, I vacuumed the shell. There's a good coating of smoke on the wall of the shell that I left as seasoning. As for the fire rings, I very carefully cleaned them in the yard with a wire brush to get rid of the stray drippings and hardened ash.
In the end, this wasn't as big of a project as I had been thinking, but you do need to be careful of the rings. I'd forgotten how fragile those things feel.