For a 737 job with one Indonesian airline, they accepted an Australian IPC in a Seminole carried out at Moorabbin. Happened only a few months ago. In other words the IPC did not have to be in a 737. All they required was a current instrument rating.
Might be worth contacting the airline in SE Asia you are going for and explaining the difficulty you face in Australia finding a 737 simulator and an Examiner. There are not many independent 737 qualified Examiners in Australia as most are tied to an airline and not permitted to conduct IPC outside that airline. Ask the SE airline concerned if they accept a current IPC not necessarily on a 737. Could save you heaps as well.
In any case you should consider renewing your IPC on a flying school light twin, anyway. Looks better than not having a current instrument rating at all on your Resume. .