With the confirmation from Sean Punch that the contract for a new version of The Madness Dossier in some form has been signed and the resurgence of Conspiracy X material in recent months, the thought occurs to me that the two worlds would interlock rather snugly.
AEGIS is a ready-made secret agency to drop in the place of Project Sandman. Its agents are already trained to cover up unknowable horrors. The Red King and its implications are right in their wheelhouse. In that way, the impending threat of History B slots right into the world of AEGIS.
For a more integrated presentation, the irruptors match up fairly well with the Atlanteans. They’re still wielders of incomprehensible, godlike technology from another time, only that other time is now sideways rather than forward. Their objective is to reclaim their world, rather than ensure its existence. And like Captain Chronos and other inscrutable time travelers, that objective may be served by acts that work in harmony with AEGIS agents’ own as often as they hinder.
 And I write that lacking the full skinny on the Atlanteans, not having yet pored over The Extraterrestrials Sourcebook.