I doubt the Civil Aviation Authority want a Coglan Air flight 3407 happening in Australia and would insist on a higher experience level, and particularly if Airbus would want more time on type. Given that there are likely to be plenty of experienced pilots out of work it would be difficult for REX to justify any dispensation on the basis that they can’t find appropriate crew.
Thanks for the warning, I’ll certainly avoid regionals if I need to get somewhere in the USA.