Elias here with Shopify Support. That's a great question!
There are several third-party apps that integrates with Australia Post available in our App Store. Some are able to integrate the shipping rates as well as bulk print shipping labels. I've handpicked a couple of apps that can help with shipping labels. That way, you don't need to copy and paste the customer's information to create shipping labels.
Both, MyPost Shipping Australia Post and Starshipit Shipping & Tracking, have solid ratings and can help with printing shipping labels. If you need any help with these apps, you can always reach out to the developers through the contact information found in the Support Section of their app's page.
I hope this provides a couple of solutions for you. If you have any other questions, don't hesitate to let me know!