Very few people even know what password managers are. If you have to onboard them into a password manager before you can onboard them into Nostr, you already lost them.

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Apple has the native keychain so that’s the default option and it’s well integrated.

https://appleinsider.com/articles/21/12/29/how-to-use-icloud-keychain-apples-built-in-and-free-password-manager

But to answer your question: 1)

My bank uses QR code on browser that seems to be dynamic (moving pattern) and you point your mobile’s authentication app with camera to it and it let’s you in.