Your idea of meeting half way is okay, but would you have electricity to play test the game?
Perhaps you and said person could meet at an agreed upon pinball show?
If you don't mind the risks associated- you could just both agree to ship, and you'll hope it all works out.
Traveling half way across the country might not be worth it to you. And if you don't like the risk- you may have to decide that the trade won't work out.