To replace the dialer see this topic here … Is there any alternative to the default Dialer app - that works on FP3?
Works for me.
Yes, I noticed Android System WebView seems important, too. Uninstalling it will break stuff.
Install a different keyboard like Simple Keyboard | F-Droid - Free and Open Source Android App Repository, and then use a PIN instead of a password, and unlocking the phone should work fine with Gboard uninstalled, as the keyboard isn’t used for PINs.
Works for me.