Not really an answer to your question but I have my password manager integrated with my email host and can generate a new masked email with one click when creat

Not really an answer to your question but I have my password manager integrated with my email host and can generate a new masked email with one click when creating new accounts. Not sure how it is as far as privacy (Bitwarden can't read my email, only create new masked emails - the option to allow read access is provided however) but as far as being able to disable problematic addresses on a whim without changing my main is pretty great.