I have had delays with vietjet and Jetstar Pacific both of which showed thet departure and arrival times to the minute after the flights were taken.
I would happily buy those tickets that you are looking at because of the 8 hour difference and the data to show of late that I would have made the flight each and every time.
As for consumer protections here in Australia, even if I bought 2 selerate tickets on 2 different airlines, if one was late due to whatever reason I have no recourse as they are different tickets.