The more I think about this, the more I like your idea
@Micah Sweet . The starter set has the guidewires and semaphores to get you through your first time running an adventure. It then gives you the basics of how to move on from that, to your second adventure. This includes building a world to stage and connect your first experience with your second. Not the entire world... just expand the immediate vicinity. Here are some simple instructions and recommendations to help fill in those instructions with your own ideas.
At this point, you've primed the pump and your students are ready to go off in whichever direction suits them.