As someone actually going through this adventure module right now, I might suggest taking a look at the Fateweaving mechanic. There's about 6 points for each path, which you could probably squeeze down to 5. With a bit of work (they are originally meant to be spread out and tie into different parts of the story), they could be condensed down to be the framework for each session, and naturally ties some boss fights already. And they can probably be modified pretty easily to be more proactive; as is, they already take a bit of input from the player (they have to choose which fate to weave and work with the DM to tie it into their character's backstory). In fact, between that and how the Dark Bargains work, it would not shock me if the folks at Avantris read the book before creating the campaign!

@Tristan Fishel We just finished our 20th weekly session (about 3hrs each time). Judging by our pace so far, I think we're about 40% of the way through the main campaign (which goes from lvl 1-13). This is my first full campaign as a DM, so YMMV.