As said, there is no requirement for a recliner, though if there is a rear seat installed there will need to be access for rear seat passengers. (generally if you dont want to carry anyone inthe rear, or if you have a rear half cage installed, they will want the rear seat removed and the vehicle registered as a 2 seater).
The ADR requiring head restraints i.e. head rests applies to passenger cars built from January 1972 (
https://infrastructure.gov.au/roads/motor/design/pdf/22.pdf)
I couldn't see any claims anywhere that the Cobra Monaco Pro's have been tested to see if they satisfy the ADR requirements. They would need to satisfy ADR 22 if the cars date of manufacture is 1 Jan 1972 or later, up until end December 1974. ADR 22A applied from 1 Jan 1975, so the detail of the testing etc has likely changed slightly.
Seats that satisfy a later edition ADR will meet or exceed an earlier ADR.
Same rules apply Australia wide... though many engineers/states are bit slack on their understanding of the law, mainly due to outsourcing of the function to private entities.