I just got my KH27.5 with the handle-bar and was a bit annoyed by the flex, and worried because of the torque applied to the mount. Therefore I added this joint to the seatpost. (To make sure, there’s no torque applied to the original mount, I loosened the upper of the two bolts)
My handle-bar now is basically attached to two joints, and the flex is gone.
I will continue to play around with the angle and the length of the bar, but for now it feels quite good. I am using the 2 handles to cover some distance on very easy terrain, and the center bar with the brake on downhills.
I have never ridden with a handle bar before, and I wasn’t to keen on having one actually, because I like the simplicity of the unicycle. But the benefit I experienced is way too big to go without it. 
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