I'm using https://github.com/basti564/Oculess which works well for removing facebook. Caveats:
* most of the UI is broken
* you can only run untrusted sideloaded apks
* some telemetry services have to be stopped after each reboot
* you might still need facebook for initial setup (haven't tried it)
https://apps.apple.com/us/app/strongbox-password-manager/id8...