I really like it! If we want just Anakin appearing, I’d say this aged-up Hayden works pretty well. Any shots of him pleased from ROTS should suffice (since the unemotive Anakin from the '04/'19SE looks dreadful).
If we’re using the original “three spirits” shots, it’d be a worthwhile experiment to try out different Anakin footage in those two shots. It could either be a new head on Shaw’s body or aged-up/Shaw-merged Hayden’s entire body.