Wow, good for you! I don't know of any. I can't wait to hear from some. Though I know a few teachers first hand that became teachers in the very subjects that were an albatros to them because of their learning difficulties/disability -
Sometimes, learning difficulties/disabilities are a bit more inflexible than you'd like them to be...
Sometimes, it is not a case of "anything can be overcome..."
Perhaps the individuals you speak of were academically inclined in other subjects, and sought the challenge of conquering the one area they couldn't excel at... that's my best guess, anyway.