We had a delay on a flight @ ZRH on TG a couple of years back which involved a missed connection at BKK on a different PNR. The LX staff bent over backwards to help us and even got us rebooked on a later BKK-HKT flight when they didn't really have to lift a finger to help.

Let them take care of you. If you go to the transfer desks @ ZRH and plonk yourself in the F/*G queue, you'll be fine.