On returning to Aust register at Centrelink convincing them that you are a returning resident, I took my daughter with me and used her address ,this was accepted aged pension granted. If you have 34 + years working life pension might drop something like $5 per payment As I was in Aus for long term cancer treatment I only needed to stay an extra 4 months to complete the 2 years for portability
I am unsure about changing from "Job seeker" to aged pension at 67 would give you immediate portability, something to ask Centrelink International division they are easier to contact and always have or will get answers to your queries