8pm Friday night should be OK too.. that's 3 hours after work gets out - and 5 hours after school - ample time to get to a game.
Plus doesn't matter if the game ends near 10pm, as the next day is Saturday.
Sounds like the only concerns are 8pm kickoff Thursday eastern time and 6pm Eastern Time Friday.
8pm Thursday (eastern) could problematic with 10pm finish then work on Friday - tough for ANY Eastern team though, not just Sydney hosted games.
6pm Friday (eastern).. well there's a solution for that, and it's a 2nd NZ team.
So only 8pm Thursday is the issue, yeah?