That is kind of what I am going for. A dewalt mount with a back plate with say a 20x20mm array of holes to mount to, when the dewalt is not there. I really wanted to do just a back wall but there is not a good way to do it. every added connection is a source of slop and lost rigidity. This all falls apart though for the non dewalt users.
Using a larger palm sized mount would pull the dewalt out of the pocket further and increase the moment arm.
As soon as this is relativity stable I will release all the specs I think are necessary for making a mount including a blank mount like before.