Try this: Whoever starts the game in last place begins the game with the wood Blimp piece. This way they can turn it in for a +1 when they start the game.
Just to note, you don't actually turn in the wooden blimp to get a +1 bonus. You just get a +1 bonus to each roll as long as you've got it. So doing this would give the player in last place a +1 bonus until someone else built an airship.