I've just now stumbled across this thread
And am most pleased with what you're presenting. The difficulty with MM fey is not that they're particularly inaccurate, but rather that the MM utterly fails to convey any sense of their nature. As far as mechanics go, the stats are usable, but useless unless the Shanachie is capable of comprehensively realating Story of the Faeire Ffolke (which you appear to be doing extraordinarily well). Of course, the latter tends to make the former unecessary. Obviously, when dealing with Faerie, this is as it should be. . .
Have Fun, Play Well,
Arrak ramirea K'Ar