You still get to walk into the hotel, go to the "library" for the video and walk into the basement to the elevators. When everyone is boarding the ride elevators, just ask about taking the alternate elevator. It will take you to the same place where the ride elevator exits.
You could also do child swapping - me and my 5 yo took the alternate elevator and waited. When my husband and 13 yo came back (they met us in the downstairs lobby), I went up the same elevator with my 13 yo so we could ride together.
Hope this helps.