At the end of the day, if you're Perth based then you are required to be available in Perth under the terms of the EA with regard to standby's and other duties. At the moment, how you get to the airport at the required time and fit for duty is up to you if you choose to commute from elsewhere.
It would be a brave person to stand before a judge and say that commuting across a continent before a long TOD meets the rest requirements.
In the UK, British Airways have banned the use of staff travel on day of operation. Naturally, there are numerous ways around this, however the UK CAA is now looking through not only staff travel but commute times more broadly. The intent is to investigate whether sign on times and rest periods are adequate given, among other things housing costs pushing people further away from the base. Suffice to say the onus presently remains is on the pilot. that BA have acted the way they have may give an insight to the way this responsibility will be handled in the future; joint liability.
Rest assured being fit for duty will be heavily scrutinised in the years to come. It would be an extremely precarious position to explain to His Honour that flying across a continent and then operating a night TOD around 20 hours had as little impact on the performance of one's duties as a short 30 minute drive to sign on.