It's not going to get a 1:2 ratio.
The quoted OW number for overseas is 185m, but that includes 27m from Wednesday and Thursday and 50.5m from China, so the true weekend numbers are 50.5m for China and 107.5m for overseas - China.
China looks set to do x2, so say 101m
The only other overseas territory yet to open is Japan, which could be good for 5-10m. Lets say 8m.
If we assume the other overseas territories are going to do a 2.7 multiplier (and remember that they will not get any Thanksgiving bump), that's 317, for a a total of 426.
If you think that legs are going to be better than 2.7, for every 0.1 you add the overseas gross increases by 11m. In order to hit the 756m you suggest, the overseas multiplier has to be in excess of 3.9, which is unfeasible.