OK let me give you the run down since I'm based here.
Basically you need to get out of the plane as soon as possible to get to departure area at the end of Row A where the check in counter for CX staff is 60 min before departure.
Assuming you are at gate 40 to 60 (most likely ), it will take you 10-15 minutes to get back to main building where the immigration is. Walk 5 min + go down 3 floors via escalator, take a driverless train (5 min), go back up 3 floors (5 min)
10-15 min queue for immigration + 5min clearance. RUN out of arrival hall (5 min), Go up 2 floors to departure hall (5 min), run to row A (5 min)
In conclusion, I think you are very brave. Let me know if you want to go for it I'll give you more details on how to run and the fastest route out
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