@gristle-cause
https://axpos.org has continued where DivestOS has left off. The dev has had help from Tavi where necessary, too.
Like DivestOS, it's based on LineageOS + (backported) kernel patches + a subset of GrapheneOS's security hardening + some (GrapheneOS) privacy/security patches + WebView with a Vanadium patch subset.
You can request support for your device if it's supported by LineageOS and if you're willing to put in the work of monthly testing.
I think the documentation is clear about the downsides, too.