I have a few tricks to help you here.
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Create a temporary bitwarden account into which you restore the backup. This way you do not risk messing up your real vault.
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KeepassXC is now capable of importing password-protected bitwarden exports.
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BitwardenDecrypt will decrypt a password protected export. Do note that it has not been updated in a couple of years and was written by a 3rd party.
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Use unencrypted backups.
Also, the risk of a data entry error is not just limited to TOTP; it can happen anywhere. Perhaps consider instead voting for this FR