Thanks for quick reply’s
Yes, I think my initial intention was embed ‘Preferences’ section (or part of it) of Discourse Profile and not the whole Profile page with messages and etc.
Do it with Discourse API seems like a pretty good solution, I’ll give it a try!
Your example of comparing YouTube and Google Plus is not exactly fit, because they are distinct brands (owned by Google obviously, but still distinct). But when someone will make a site and a forum section, they likely wanted both to be under the same brand and have one profile page when user can set their email or language. Or may be one Profile page and one Settings page that looks alike.
I found a better example, consider Google Plus’s Profile page and Settings page. They are different, but still share the same header and looks alike.
So my proposal here is to invent possibility to move User’s Preferences a bit away, or may be, set for them a different header.
Or may be the possibility to embed just Username and Avatar, so it will always be visible, not only in Discourse.
I’ll think about it a little more and may be come up with good example.