I created https://www.printables.com/model/530894-decathlon-gps-mount-attachement in order to offer more attachment point to the Decathlon GPS mount.
This is using it in order to accept any GoPro like accessories.
I reused an old nut from a GoPro mount I don't use anymore and an original GoPro screw to secure any accessory I want.
The author marked this model as their own original creation.