That would certainly be simpler, in that it just fits in to the existing password login, but I'm not sure it helps all that much here? Mainly because the point of this suggested approach is discoverability; your password manager can change your password without you having to manually do it. Most of the time, this doesn't apply; a password manager knows that such-and-such-a-site has such-and-such a username and a password, but it doesn't know how to actually log in with them, just that these are the values, and maybe these are some form fields on a particular URL to fill them into.
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