I reckon this might work. Do you reckon their systems are up to date enough to reject CCR access for a T3 First? I doubt it.

Probably hasn't happened many times before mate. The lounge people are off their game most of the time this will either throw them completely and they'll need a mini conference to make a decision or they won't bother and just let you in lol.

If you were incoming from BKK in F in T3 connecting to T5 domestic they would let you in to the CCR so this is like that only reversed and a bit aroundabout.