Bitwarden and iCloud Keychain user here. I'm looking forward to the 2FA improvements in this year's macOS. It'll mean I could, in theory, mostly ditch Bitwarden as that's the big use case there for me.

You can create a shortcut in the iOS shortcuts app to open the Passwords area of Settings via an icon on your Home Screen. Just open the following URL in the shortcut:

prefs:root=PASSWORDS

Best tip I have for you around iCloud Keychain right there.