repeating bacon (or any of the other 2047 bip39 words) with an additional passphrase would be only marginally safer as a plain brainwallet (sha256 of a passphrase) which isnt safe at all. pratically a passphrase 'strong' enough may not easier to remember than seed words it's not advisable to do rely on passphrases because the speed and cost for checking brainwallets (and its variations) can only get cheaper overtime