i know i’ve said a lot about this in recent posts but i’d be inclined to supplement EA’s work with connolly’s as she deals directly with daemonolatry etc and has a bunch of books out already (i.e, take them or leave them).
it’s not at all a vastly different system, although some parts do differ like circle constructs and the like, but much can simply be merged or incorporated into what we already have, like daemonic enns, correspondences, sigil catalogues and gote openenings (which im’ working with now, and it’s awesome).
there’s too many half-baked systems out there to keep up with them all. i bought a grimoire called the chaosium something something. it’s a lovecraftian thing, and i was somewhat underwhelmed and definitely couldn’t be bothered learning all their circle casting and ritual tool making etc etc. i’m gonna stick with the solomonic cycle (which includes much of EA’s and connolly’s work).