This could be a wildly stupid idea, but what if minor update and major update weren't twelve hours apart? Like major update occurred at the same time, but minor update was only five hours before major update. That way, to both Americans and Europeans, update for them occurred around midnight. It's possible to do something like this now that update isn't linked to issues.
I think the gameplay could be far more exciting with this kind of structure because the major and minor crews would be working in close collaboration and there would be lot of competitive back and forth between the two updates close together. Major updates would become vitally important for liberations to liberate occupied regions taken at minor, prior to piling taking hold of the occupation.
I would expect that nineteen hour gap (as opposed to our current twelve hour gap) between the major and minor to be kind of the calm before the storm, full of preparation and anticipation.
Five hours is also just enough time to squeak a WA resolution into the queue if you're good. If I were still a young author, I'd try to swing it.