There's a bit more but honestly not much that can't be skipped, I like the novel a lot but it's mostly people talking about why they did what they did and why they have to do what they do, how some things are inevitable etc., it's an interesting read but as a movie it could easily drive away the audience in my opinion.
I wouldn't mind them either stopping after Chapterhouse or coming up with their own final movie. Under NO CIRCUMSTANCES should they ever adapt the Brian Herbert/Anderson stuff. It's so bad, it reads like bad fan fiction, it's like a Star Trek film with the following plot:
Kirk in the 35th century teams up with every major character from TOS, TNG, DS9, VOY, ENT and DIS and they fight the superborg and the superchangelings and the superchangelings think they win but then the others are like "psych, we knew about your plans" and press the superchangeling kill button and every superchangeling in the universe drops dead. And then Kirk kisses the superborg queen and because he's Kirk she gets an orgasm and makes him the superborg king and dies. Superborg King Kirk then tells all the superborg that the war is over and they're all friends now. The End!