For what it is worth, I often use the lounge when flying to "Schengen" countries where there is no passport control before boarding even though the lounge is inside the passport control. I go through passport control by showing my lounge card and then up to the lounge. On exiting, you can get a pass which lets you go back to the "don't need a passport" zone without standing in line. In principle, this should work between terminals as well, but you a good quarter of an hour getting between the terminals.