Interesting; makes me want to hear more about these muties.
The accent thing didn’t work for me though; I always do a double-take when I see people thinking (rather than talking) with an accent. I don’t think people would notice their own accent much, when thinking to themselves or even listening to themselves talk. I think the general advice is to keep the main characters of a story without accents, and just accent foreigners they meet.
Lee Braiden