I had a similar-ish problem with my ORD-AUS portion of a transatlantic itinerary moved from a 8pm arrival to after 11pm arrival.
I called and asked to be re-routed through DFW which was done free of charge after explaining it was a significant change in routing.
Perhaps if you called up, but be prepared to explain why the itinerary is no longer suitable following a change that was outside your control.