Well, ostensibly the knucklehead doesn't want to get in the boat, but that's the whole reason the player showed up.If you want the knucklehead to bite the hook you need to make the bait look interesting.
As a GM, I am adamant that players need to create characters that want to engage in the adventure/campaign at hand. I do not want PCs that refuse to work with the group or have personalities and backgrounds that drive them away from the adventure. It immediately throws up a red flag for me. Players like that view the game as about them, individually, and the story they want to tell about their character being more important than the game and group as a whole. I don't even like it when players create their PCs in isolation. I want a session 0 with everyone talking about their characters, both roleplaying wise and mechanics wise. Again, it is a group activity and everyone is responsible for supporting and contributing to everyone else's fun and the success of the game as a whole.