No worries. It is time consuming and laborious, i completely understand what your saying. When i'm not blasting i do my own trt as well, its not only easier for me to do it this way but also cheaper and less time consuming as you have already mentioned.
You could always contact Australian Customs and ask them for their advice. You definitely are not the only person who is using medication for a legitimate reason. I'm fairly certain customs will tell you that you need a script or referral etc from a doctor or something along those lines anyway.
Next best option is to source gear here once you arrive, or better yet sort it out prior to getting here so its ready for you when you arrive here.