You are aware that paddlewhellers are the most difficult boats to control in any moving water, and or a breeze.
I authorize you to install a large, fixed, straight, anti - drifting fin, in the very front of the bow, out of sight.
I would suggest you to add 1 or 2 stern mounted rudders for the best control possible.
They can be Y connected.
You will need the rudders & turn fin with any setup that has 1 or both wheels at the same speed.