Great thread of ideas, lots of useful stuff in there!
In regards to the set of Animae Merinita spells, I'm not sure if the creation of specific faeries is permitted under the guidelines. To quote HoH:MC p.94 in the guidelines:
"A Muto spell transforms a mundane thing into a faerie, usually something appropriate to its nature, while Creo simply summons a faerie associated with the and form, and the maga has very little control over what."
"Very little control" is unfortunately imprecise, but would seem to preclude picking a specific creature with known, predictable behavior. That said there's no guidance on how this sort of thing should be done in practice. I think I'll start a separate thread on this.