So something to think about, that while its all well and good to try and get the Dwarfs and colleges on board, we really cant slow roll getting at least one of the elf factions involved when we are working on their front lawn without burning bridges fast.
So baring new information. I think the first one we should try is Ward of the Frost.
Regardless of whether or not she was speaking for herself or as the mouth piece for the high council, Vicereine Cadaeth is the one that made all the promises for choosing to do the project under Laurelorn. and that includes a heavily implied promise of her own help, or at least her company, and she might as well help if we are going to make her keep her word about hanging around to keep us company (we can do semantics too!)
plus, they have a vested interest in peaceful interactions between humans and elves.
after them, its one of the Hoeth Saphery clans obviously, it's just which one, they both have pros and cons.
Major House Ellemakil: easy sell? will at least make it easier to get the cult of Ulric and involved if/when we need it. though if the stereotypes about Avelornians translates to their distant Expats, they will be the type of high society nobles that mathy is all thumbs with.
Major House Fanpatar: one of the easier sells, but Iffy on how useful.
Major House Tindomiel: Originally from Saphery, and one of the two Major Houses influential in the Temple of... Hekarti? Isn't she a Druchii Goddess? Well, they did vote in favour of interaction with the Empire so they might be a better option for a magically-inclined Major House to bring into the project than the two Hoethian ones.
Terrifying, 1: because they want to interact with humans, and 2: Mathy doesn't
quite realise what Hekarti is the god
of. 3: they might be the only easy magic clan sell! (I really hope the cult Atharti is
not interested.)
The Grey Lords: obviously we need to look into this, but its such an obvious hot topic button I can see it smoking.
on the flip side, there is the Major House Malforric: and the question is: 'is it worth the work to at lest get them to be neutral about us, or are some battles pointless and we should just move to assume that they will be a pain in the ass.