We did this today, you request the time at the entrance to the ride. We requested the return time at 9:25 when the line was still entering the queue but indicated 2 hours. The return time was 10. When we came back we went through the express pass line side from the beginning and walk right to the last underground room before loading. There was another similar family doing the same.
They scanned our passes again and I could see the “express pass” logo on the staff members screen and then we went on through the last room of the queue.
I think the final, skinny line before you load will be very challenging for some guests with AAP it’s very confined.
The ride was amazing.