Comment moderation is a somewhat annoying task because it involves a number of very manual (and error prone) commands. A web UI to approve/discard comments would be a good way to speed up moderation.
Authentication could be done either via TOTP (easy to implement) or more a involved FIDO/U2F which requires a tiny bit of javascript and an exchange of json payloads between the browser and the server.
Since the comments can be dangerous (it is user input that hasn't been validated yet, after all), there will be a need for some kind of html-escaping mechanism.