Interesting idea, it may be a pain to implement though.
My question is: If the boat has a mass significantly greater than the character (like 100x), then won’t the force applied to the boat be insignificant? (Make sure bPushForceScaledToMass is true on your CharacterMovementComponent.) And if you want nothing to be able to apply force on the boat, you could set the boat to be kinematic, right?