They will let you in approx 7:45am.
I’d target being at the front of the MK in the PPO ADR holding area (which is usually on the left if facing the front entrance) around 7:30am. You will not be first in line among the PPO ADR crowd, but you won’t be last.
I’d leave BLT 7:15/7:20am - the security station on the walkway to the MK will be open and is usually pretty efficient.
Have fun!