Did you ever find something for this or did you end up just converting Curse of Strahd?
Yeah I've ended up going with Curse of Strahd. Finally had my session 0 last weekend, and I've got my own custom-created ~2–3 session introduction before they get to Barovia, so if something happens to turn up I could still pivot, but at this point I'm expecting to go into Curse of Strahd fully. I'll be consulting this guide from the Alien site, and probably some other resources from that community to help.
Gotcha, that makes sense. You'd think there would be some kind of official Paizo vampire Adventure Path with Book of the Dead, I'm surprised there's still not one published tbh. Although, that's a great guide they put together, thanks for linking it! I don't plan on running CoS but I can use the conversions somewhere in my homebrew all the same haha