Remove Author Slug & Replace With Username

I reviewed all related questions but none tackle this exactly so I’m posting the question in hopes the pro’s know how to handle this. I would like to change the author slug to remove the term /author/ completely like this;

currently example.com/author/username

want example.com/username

Moreover I’d like all posts related to an author to look like:

example.com/username/post-title

URl strucutres would resemble a.) either wpmu or b.) cpt without actually building either.

To add more context. I’m building a multi author blog where users have independent pages (author pages) that they can build, post, and share. All posts created by all authors will be included in the main loop (for now).

What’s my best case scenario and worse case scenario to achieve this?

Just an idea: Use a MU installation and give the blog names the names of the authors (use Sub-directories). This way you should get much closer to what you want to achieve with on board stuff.

This means that you’ll get your author names appended to the original domain and when you go there, you’ll see their blog pages = author posts.

http://example.com - main domain
http://example.com/hans

This solution would avoid any sort of programming.