A company called Feiyutech has put on the market a WG Wearable Gimbal, it is a 3-Axis gimbal for the GoPro that I use now on my Modified Brooxe Vertical rig. This unit will set you back $309 bucks but, if you ever tried KAV without a gimbal this tool will change your mind. I have only used it once and I was very impress with the smoothness of the video and not the helter skelter video that I'm use to getting. There are limitation the gimbal will shut it self off after 7 minutes of use for some reason need to email Feiyutech about that. It is also is a solidly built all metal unit that unfortunately will add 6.6 oz to your existing rig setup but, it is a trade off I am willing to accept for smoother video. Go to this link to get more info http://www.bhphotovideo.com/c/product/1170808-REG/feiyu_fy_wg_3_axis_wearable_gimbal.html
I do have to return the unit for a new one, one of the springs in the battery compartment broke off from its soldering point they may need to be reinforce another thing I will mention to Feiyutech.