Hi folks. My son just bought a 2005 Prius. The radio is a 1-CD non-JBL unit with a 6-disc changer underneath it. What are the options for adding an aux input? A sensible option to me would be to switch the changer for the storage cubby and plug one of those bluetooth adapter items from Amazon or Ebay into the spot on the back of the head unit. Would that work? Has anyone done that? Thanks!