I will let you know the result.
At Txf desk when they realized my travel companion who was going onto an international flight couldnt speak English and didnt understand Airports and I could translate I was invited to travel on the bus. It seemed important I had a boarding pass even if it was only domestic.
When it come to board the agent scanning BPs stopped me but the supervisor waived me through.
Then to get back T1 to T3. No probs ofcourse with my BP for next domestic flight. Sitting in domestic J lounge now.
BTW they modified the halls so the turn off to immigration is right next where you get off the escalator from the bus. good move.