The other option is to lock them in the coop for about 4 days so they again know where it is safe to sleep.
I'd do this, much easier on you and the chickens will adjust.
When I built a new coop (placed about 10' from the old) I locked the chickens in for 2 days, then let them out. The first night two of them headed for the spot where the old coop was and just sat there, but by the second night they all figured out to go to the new coop.