You can find an Indian actress who can have an Aussie accent. Shit I ain't even asking for an Indian accent, I'm Indian, and my accent is that of a someone from Long Island.Well I agree that they could make a new indian character. Chloe all of the sudden having an indian accent would have been very weird though. Plus they made it part of her story that she is part australian, so having the accent still works. Otherwise they would have to specifcially get an indian VA that can do a good Aussie accent.
You can find an Indian-Australian actress.
Mind you it's a small thing, but like everything else, devs keep going with the more convenient path. So you get the whole range of naughty dog retconning a character to a person of color to Japanese devs who don't give enough of a shit to vet this shit.
The small stuff equally needs to be corrected.