I don't think pieces of Eden can be incorporated into this. I was not
really intending for Templars to play a part in this because the only AC aspect I wanted was the weaponry that are available in the games. Here's a thought though: there's an inner circle of Templars that want to use the Chantry to have more authority over Ferelden nobility. Their hopes is to create they're own form of law that gives Chantry authority over the governments.