If Australia chooses, with the consent of the Parliament, to amend its law so that Australia mimics propositions that occur in international treaties, then so be it. It must never sign a document that diminishes Australian sovereignty unless there is an explicit proposal put to the Australian people. This is not an issue of nationalism but of consent. The right to life and the right to defend oneself would be a good start. The majority could change the Bill by way of referendum, but a majority of votes in a majority of states is difficult to achieve.
Entrenched legislation is just that.
Hard to undo. Rights to income, jobs, shelter and so on are not rights at all. They are dependent on resources. You cannot use the constitution to even up the distribution of income in society. Judicial decision-making is good at determining individual cases where the financial implications are immediate and direct.