Lol I am still of the opinion of WHY am I killing the Emperor at all? I don't like Astrid very much or the DBH so why am I agreeing to do any of it. Usually I steer towards Chaotic good and not Evil but just to finish this storyline the emperor dies tonight lmao.
Do it as I did: take a hard save before joining them, then rush through their quests, and then reload the old save.
I found the DB questline extremely enjoyable, actually. In my opinion, it was easily the faction into which the devs had put most of the quite memorable little details and lovable creepy ideas. And I'll definitely do it again and pay even more attention to these lovable little details then, but not on this current character.
If this character feels like interfering in the orphanage again, then Astrid will rather meet an untimely end.