It's all a bit divisive and unnecessary.
The current constitution states ....( republic vs constitutional monarchy another issue altogether...)
"It shall be lawful for the Queen, with the advice of the Privy Council, to declare by proclamation that, on and after a day therein appointed, not being later than one year after the passing of this Act, the people of New South Wales, Victoria, South Australia, Queensland, and Tasmania, and also, if Her Majesty is satisfied that the people of Western Australia have agreed thereto, of Western Australia, shall be united in a Federal Commonwealth under the name of the Commonwealth of Australia. But the Queen may, at any time after the proclamation, appoint a Governor-General for the Commonwealth.
Now in 1967 the referendum repealed Section 127 which previously read :
"127. In reckoning the numbers of the people of the Commonwealth, or of a State or other part of the Commonwealth, aboriginal natives shall not be counted."
The Australian Constitution is the founding document of our nation and pre-eminent source of law in the country. The Constitution sets down the powers of each of our three branches of governance – the Parliament, the Executive and the Courts, for the people. Technically (and belatedly) aboriginal people have been recognised by the constitution, as people of Australia, since then. There isn't any legal requirement to delineate "people" even further as Aboriginal people etc etc. Only political.
No need for any more mucking around with this instrument. The Govt, as elected by the people, for the people, should enact/proclaim laws and legislation for all of the people, regardless of race, creed, religion, orientation or place of birth.