I would assume you can
The BNE-SIN-DXB flights you have to deplane.
The SYD-BKK-DXB flights is optional to deplane.
I would assume in KUL it would be similar as in required or optional. You can and have people who simply are only flying to KUL, and others just doing the KUL-DXB
What?! I thought everyone had to deplane during any stopover that's not just a fuel stop? How do the cleaners empty, clean and restock around half a plane full of people? For those pax only flying the second leg, they would expect an 'as new' seat- how would a cleaner clean a window seat with someone sitting in the aisle seat the whole time?!
So a visit to QC is not going to happen?