You can try to use the default utility layer scene to have your mesh drawn after the GUI (if you put the mesh in the regular scene it will be drawn before the GUI):
It does work as long as you don’t rotate (only translates). If you rotate or zoom with the wheel, the mesh will zoom in/zoom out accordingly, making it go away from its background… That would not be easy to fix, as the mesh is in 3D space whereas the disk background is essentially in 2D space.