As I stared with my Tarot T-2D gimbal the fact that I had to unmount the whole camera to access my movies and pictures annoyed me because the camera sits very tight and it doesn't feel very good how much force it needs to get it out.
I found a very nice solution:
The flat cable is very flexible and makes it possible to have the card behind the gimbal so you can easily access your micro-sd card. It's the perfect solution together with a 5V BEC which charges your gopro while flying.
It can be found here: AliExpress
Greets from Switzerland