No matter how you look at it, someone is going to be left out. What it really boils down to is who would be more interested in this event, Europeans, or Australians. I would assume that the Australians would be more interested in this scenario, but at the same time I would think there is a larger European player base.
7pm EST, 7am down under, 1am across the pond
4pm EST, 4am down under, 10pm across the pond