I'm not sure time matters.
An immutable nsec and NPUB can be created, I don't see why an immutable failsafe NPUB can't also be created.
Maybe I'm misunderstand exactly what you mean?
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You would need an event signed with the first key that references the backup key, no?
If I get access to your private key, I can just publish an older event certifying a public key I control.
Anyone who tries to visit your account will be redirected to the oldest verified public key (my own).