@Jie40 we had the same situation. I'm also from Perth. Me and my wife's passport expiration shall be due this April 2018.
We have 2 options:
1.) Fly in to PHL embassy of Sydney or Canberra and pay the passpost fee of 100+ AUD.
Will take 8-10 weeks processing time and really requires personal appearance for photo.
2.) Await for Perth's mobile passport come early 2018 schedule (expect long queues).