So I turned my 3D design into vectors and made a 2 part wooden wall mount.
The 3d printed part is a snap fit and looks like the image right below.
The first part firmly screws into the in-wall box (the holes on the first part) that holds the electronics.
The second part, the face, has walnut veneer, which is exactly the right thickness to be flush with the screen. This second part then screws onto the first part.
The screen is glued to the second part.
This is just a prototype and I need to preposition the screw holes and cut larger holes in the veneer for the screw head. Also need to find some nice decorative screws and paint the IR led part.