Slight thread drift on my part, but this may offer some further thought into whether or not to depart Australia without a current medical or IPC.
I'm in Asia and out of work due to the pandemic and now age. Applied for a sim instructing qualification which was accepted by a well know identity in this region. Long story short, but everything I previously held has lapsed so my foreign license (Australian ATPL) has to be validated again, and this includes an Australian medical. My Asian ATPL expired piece by piece and is now worthless. The bare minimum I now need is a CASA Class 1 medical, and this is for a sim job, not flying. This requires travel overseas to complete. As others have alluded to, I'd be cautious about leaving Australia without the backbone of a current Australian medical and IPC.