My expectation is that the RAAF will inevitably purchase a...

My expectation is that the RAAF will inevitably purchase a modern version of the F15 to complement its F35s, just as the USAF is doing.

https://www.military.com/equipment/military-aircraft/everything-you-need-know-about-air-forces-new-f-15ex.html

Rather that trying to build components for everything, Australia should purchase the F15 EX off the shelf and therefore cheaply..

Many countries China has been rattling of late will be thinking along these lines. They will be seeking unit numbers for a fixed price and quickish delivery.