Hmmm, you bring up 'home of the brave' in the national anthem (which, ironically, is set to the tune of a British drinking song - historical irony for you) gives me an idea.  There is zero reason for the image attached to mascots like "Warrior" or "Brave" to be an Indian caricature.  Other schools have changed images without changing mascot names.

Why not hark back to Francis Scott Key's poem and the Revolutionary War.  The image could be of some man in a late 18th century tri-corner hat.  I think it could work.