I would just go with the 6hp tohatsu sail pro. It will vibrate, but it will get you to hull speed. I am pretty confident that a T22 does not take much to get moving.
Interestingly the 4hp Tohatsu is the same engine as the 6hp with a different carb, shorter leg, no charging system, and a different prop.
If you can, get the "elephant ear" prop from internet outboards. I have heard bad things about both internet outboards and online outboards, so take your pick!