because of the check against darkweb leaks or whatever type feature when you pay. That's seems like an anti privacy thing. I understand it's a good idea albeit seems to expose a lot of information about you

For the password leak checks, your passwords are never transmitted. They are one-way hashed locally, and then only the first few characters of the hash are checked against the API provided at https://haveibeenpwned.com which is run and designed by Troy Hunt, one of the most respected people in the cybersecurity industry. He collects major password breaches and makes them available to check against without actually exposing the data. It's perfectly safe and secure.

The bitwarden clients also work when there's no connection to the server, since they sync the vault. You just can't add any new entries. That means spotty internet is not that much of an issue in terms of using it. It also means, that every device that has a client installed and gets used regularly (to give the client a chance of syncing) is automatically a backup device.

I host vaultwarden at home. No real need for a vps since your passwords are synced to your phone or laptop(whatever client you're using) and you can just sync it when you're home if you make changes, or setup a VPN (I use wireguard) and sync on demand when needed.

That said, I do sync my database to a vps for dr purposes incase my home server suddenly vanishes... for critical services I follow a 3-2-1 backup rule but it's not absolutely essential.

Follow OP's approach. Use a Keepass file. It is offline and can be stored anywhere you can reasonably trust. You just need to sync it if you have many clients but syncthing is great for that.