I've actually got the custom kirk plates for my 5DIII and 70-200II already thanks SwampYankee. I actually connect my black rapid strap to it with a kirk clamp too. Nice solution.
Maybe I should just stick to Kirk then and get the BH-1 if both ballheads are close in performance.
I'm in the same place. Quick, cheap suggestion. Get a wrist strap for your camera. Since you are using a Black Rapid this thing goes into one of the unused neck strap mounting points. It also has a detachable clip. Anyway, I really like working with a wrist strap and when you are working with the tripod it gives an extra sense of security when you are moving the camera or changing lenses. Bonus....dirt cheap....http://www.thephoblographer.com/2013/02/19/review-optech-slr-wrist-strap/