GoPro 30pin to USB cable

If you're using a GoPro as I do with Quanum G-2D gimbal, than you know how difficult it is to mount and then unmount the camera from the gimbal so you can access the SD card and charge the battery. The solution is to leave the camera in the gimbal, and access the USB port by way of the 30pin connector on the back. You can download and format the SD Card and recharge the camera while it is still in the gimbal. I would love to have a cable like this, and checking the pin out of the gopro 30pin bus, it has all the USB connections available. For your consideration.