Holographic Optical Elements certainly have potential for applications like this, and the 3D Hologram Printer could be a great tool for simple prototyping and quick iterative testing.
Recently, Maimone et al at Oculus/Facebook Reality Labs used our hologram film to make a design for a thinner VR headset using pancake lenses incorporating holograms: https://research.fb.com/wp-content/uploads/2020/06/Holograph...