I think with some work and de-engineering, you could remove the ball mount from the back of the Pitaka mount. It does not appear molded to it.
If you're looking for a much simpler magnetic mount (without Qi) to remove the ball from, check out the Spigen Kuel. I removed the ball from that with relative ease to attach the ball to my Evutec mount. The remaining Spigen mount was flat (albeit with the slots from the ball mount).