You have to wonder when the game will be played.
Anytime on a Sunday US time will be a Monday in Austrailia and there are no Austrailian public holidays in the football seasson until Christmas.
An evening game in Melbourne would be the middle fo the night in the US (at least the Eaast coast)
I can't see them having an international game late enough to be at Christmas or when the college seasson has finished so there are NFL games on a Saturday.
To be in an existing time slot I'm guessing therefore it will either be a late game kicking off around 8am local time of SNF kicking off around noon on a working day in Austrailia. I am not convinced that will work to get Austrailia excited about the NFL.
The other possibility is a Saturday lunchtime game in Melbourne that would be televised in the US as Friday night football but that will upset college football.