This is actually one of the things bringing in a WA team would help fix. The two hour time difference would mean you could have a game on the east coast at 7 and a game on the west coast also at 7 (locally) keeping the two games for Friday's but spreading the time around. Similarly they should already be making use of New Zealand to fill the first Friday slot, making it a 5:45 game but 7:45 locally.
But why would Fox Sports Australia want to fill that spot with a team whose fans base won't be watching on Fox Sports Australia? Not to mention if they want to maximize the amount of fans who would stay put instead of switching to ch 9 it makes sense to have 2 Australians times more times than not.