Good luck in Australia. They’re a lot tougher than the US especially on a LOB.
My wife and I and another couple went to Australia a few years ago, planning to dive off of two different boats, including a LOB, on the GBR. Reading ahead, we saw all those dire warnings about how strict things were with medical form requirements in that part of Australia, and we all got updated medical forms signed by our doctors and brought a copy for each boat.In Queensland when going to GBR. They have other states with other rules.
The first boat was one of those huge day boats heading out to the reef. We all had to meet in groups with the DM for our group to handle all paperwork. We produced our medical forms, and the DM looked at them as if she had never seen one in her life. " Why did you bring this?" she asked. All we had to do was sign a single sentence saying we thought we were medically safe to dive.
Roughly the same thing happened on the LOB. We had to sign a single sentence saying we were fit to dive. No need whatsoever for a signed medical form.