Besides Graphene, there's also CalyxOS [2], which is basically like LineageOS with MicroG [3].
And for those who want GApps, they might like their Pixels on stock OS. In fact one of the more popular custom Android flavors these days is Pixel Experience, [4] trying to port these features to other devices.
1. https://forum.xda-developers.com/t/rom-unofficial-raven-orio...
grapheneos.org
[1]: https://old.reddit.com/r/GrapheneOS/comments/du23la/rooted_o...
Your best bet is to just search for how to setup Xposed on your phone+ROM then try the different modules to see if one works for. Ideally build it yourself from source since you don't want to trust random code being injected into your trusted apps.