Re: Using bbpress as my “blog”… adding a header navbar
You could use bbPages (https://bbpress.org/plugins/topic/bbpages/) for pages. You’ll probably need to edit some code yourself though if existing plugins don’t do what you want and possibly write some of your own as well. WordPress is really more geared towards this sort of thing with regards to WYSIWIG and image management, to even allow images on bbPress you need to install a plugin and BBcode is probably the closest to WYSIWYG.
I’m sure with a lot of coding, you could get bbPress to behave like a portal, but why not just use WordPress and integrated bbPress?