Haema is a mod that synergizes well with Bewitchment's vampirism, making interactions with other players more interesting due to being allergic to sunlight. I'm not sure if it would fit well in the modpack or not, but I think it would be fun to play with! The benefits you can gain through rituals are offset by drawbacks such as the obvious of burning in the sun, along with being hunted by pillagers. You need to put time, resources, and effort into becoming more powerful as a vampire, but you can never get rid of the downsides.

oh! the bewitchment compatability wouldn't come into play because, since curses are disabled, you can't turn into a vampire through bewitchment