Hello Chris, and in fact, you can do it. If for example you create a custom page on which you add the messenger block, anyone who has access to this page (so you can play on the level of membres), can join the discussion, like the shoutbox. In addition, the chat channel created with the name of the page, will be accessible via messenger for people who have joined via the custom page, which does not prevent you can also add them manually. Is there something missing here?