Can the last player in a trick win with Change Rage?
No, the last player cannot win in this way. From the wikipedia link


  The 14 Rage cards in the deck have black borders and, with the
  exception of the Wild Rage card, do not count as being of any suit and
  therefore cannot win a trick.


Honestly, I'm not really sure where the confusion is. The card changes the trump color. You then evaluate the other cards played on the trick, find the highest card of the new trump (or the highest of the led suit if there are no cards of the new trump), and it wins. The only player that can't possibly win the trick is the one that played the Change Rage.