Is anyone interested in such a service? We are a group of early-career researchers who have launched https://conpher.com to enable researchers to search for and share advice on journal publishing experiences.
Our initial thinking is that the plugin simply allows a link to be sent to your authors in an email which is part of your standard process. The link connects them automatically to an account in conpher which contains the doi of their article and they complete a brief author experience questionnaire. We process the data, benchmark it and share it with you the publisher. You gather invaluable feedback on your processes. For a further discussion contact me John Marshall at jm@conpher.com