Kremmen, you might need a ticket for airside bus transfer to T1. Maybe you can ask an NH staff to give you one. I got one, though unsolicited, when I told them about my possibility of getting a flight at the last minute from T1.

One or two TG flights out of T2 is/are codeshared by NH. For this, I am sure NH offers a boarding announcement at their lounges. I had a funny experience with this, taking a TG flight as a NH codeshare. JL turned me down because the ticket had an NH designator. NH could not handle the check-in without going through a thick manual. NH just started code shareing in January. Not many of the staff were familiar with those TG flights. NH told me that JL was not supposed to turn me down under their contract ... etc. etc. quite cumbersome.