Duplicate 5* Heroes

I just wanted to make a suggestion about duplicates 5* that I think would benefit players without damage SGs pocket book. How about an exchange for an item. Like a trainer hero but it would give u enough leveling points to go from 4/1-4/80, or at least 4/40-4/80. I would absolutely give up some duplicates to save my self weeks of grinding away to finish a 5* hero.