The flake itself is thick and strong, but the amount of leverage you have is enough to remove it from the wall higher up just out of view of the photo. All I really need to do is ensure that the flake is not able to be levered outward away from the wall when cranking on the bottom part of the flake.
So I thought about sinking a 10mm hole about 20-30cm from the bottom; glue in a 8mm stainless stud; and attach a big washer, thereby removing any outward force when using it as an undercling or sidepull.
This also seemed the best option, as not only would accessing the space behind flake be difficult, but quite a bit of glue would be needed to fill the space.
Any thoughts or comments?

