Create a second Drupal name?

I've got a use case where my site Users should have the option to create a Nickname in their profile.

If they do that Nickname would  act as their Drupal username throughout the session, so it would be displayed in Groups, Forum, Discussion, creating Nodes, etc.

(I can't allow Users to edit their current Username for other reasons that has to do with the CAS module)

So, suggestions?
sandshakimiAsked:
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