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It already exists: keepass and sync your DB on all your devices with syncthing (which is p2p).

Or host vaultwarden on your homeserver and access it only through wireguard/nebula self hosted VPN.

Note the KeePass's resistance to the attack mentioned depends on the security of .NET's secure string, which, here's what Microsoft has to say about it (https://github.com/dotnet/platform-compat/blob/master/docs/D...)

As for KeePassXC, last I checked it didn't even bother.