2300 mile drive on a 3-day temporary plate. Only thing AZ law says about out-of-state-ing it is that the plate can't be used for "commercial interstate travel," so my jaunt was (arguably) legal. Not sure how other state temp plates work, but I seriously doubt any cop would pull you over for an out-of-state piece of paper in your rear window...
Just get the temp plate and don't speed til you hit the border.