What you have done was the original design idea, on the prototypes the space was a bit limited for the strap, maybe they have found some space with a different layup. Double sided tape is not the idea or solution, but a spacer on the stiff hatch is all that was required to stop the servo lifting. The frame takes most of the load and there is not much load spread over the screws.
CARF’s only failing is not getting the manual out with these early kits to show what was intended. (then we all know that modellers go their own way many times-particularly in Europe)