Yes, there is a kid swap program where you can trade/upgrade.
Seriously though, there is such a thing. At most attractions (Hulk is one of the few exceptions), Kid Swap works as follows:
Tell the TM at the front you want to do Kid Swap. Everyone goes through the line together. When you reach the TM that asks "how many?" Make sure to tell them how many are going and how many are going to the waiting area. Those waiting will be directed to said location (often the ride exit). When the Rider exits, they switch spots with the Waiter. The Waiter will be put on one of the next available (less than 5 mins wait) ride cycle.