@DragonParadox,
Could we ask the Crown, based on some minor talent or Wizard Attaché, the same sort of question we asked for Soulgazes, but for the Sight? A way of getting more out of it (understanding it better), and maybe a second question for a way to make it safer?
Then we'd make a book for each, and put them on the same file, and use a question on the file itself for how best to accurately combine them. (Like using the Crown on a book of ancient lore to learn about its subject).
I mean, try and see it from their perspective. A powerful and scary outsiders with inexplicable knowledge comes in and solves all your problems, then starts making grand promises that happen to involve subjecting wizards to their powers and the miraculous work of their hands.
There's no particular reason to think they're malicious, it certainly wouldn't make a lot of sense given the trouble they went to helping, but at some point the deal becomes too good to be true.
We might as well wear an "Annatar" name tag to the meeting; it'd be considerably more subtle.
Annatar: And here's the book that teaches you all about Hell, and why you shouldn't go there, and all the ways you can take advantage of those who are there if you go anyways! After that, here's this book regarding Soulgazes, the automatic technique that makes you afraid to look in people's eyes, making you seem untrustworthy? Yeah, this makes them safer and more informative (for you!), so it's more of an advantage even if it does push the masquerade a bit if you do it to mortals.
Wizards (excited): These are most excellent offerings, Lord of Gifts! We owe you much credit for these works!
Annatar, still warming up: I'm not finished. You can't speak to each other easily, or transport yourself without the Nevernever? I can summon spirits that let you use technology and join the twenty-first century, like every other supernatural faction save Faerie! You can finally bring your influence and power to bear properly, and enjoy life's critical support technology like phones!
Wizards: Wow, what a gamechanger! You can't spy on us through that, right?
Annatar, not even close to slowing down: And I have a pocket dimension that definitely isn't a Hell, so we could trade! Magical materials, crafting regents, impossible metals and superconductors! I have supercomputers I can give you!
Wizards, slightly creeped out: Our Yomi Wan expert says that's definitely a Hell. Are you a demon?
Annatar: No, how dare you distrust me? Harry, calm down, they're being reasonable (and slow). Don't judge them.
Wizards: Well, she's got an army. But she seems nice -.
Annatar: TRAITORS, BITCHES! GET'CHA TRAITORS, HALF-PRICE! BUY TEN WARLOCKS, GET FIFTY TAKEN ALIVE FOR FREE! ARCHMAGES, WEIRD MONSTERS, DEMONS, I'VE GOT IT ALL!!!
Wizards: We owe her everything now, don't we?
Annatar, still not fucking done: Would you like me to rez your ded 4U? #WhiteCouncil&AnnatarRHomies4Life
White Council: AAAAAAAAAAA-
Annatar, checking her nails: And seeing how much you liked that book about soulgazes, how about I throw in another one for the Sight?