Yeah. Changing Ghost Hayden to his ROTS self would make it a lot more palatable in the first place.

For Episode IX, I believe a subtly aged Hayden is the best approach. The close-up of each Force spirits lasts a couple of seconds, at least in Jonh’s edits. If it’s not instantly recognizable for most it will cause more confusion than wonder from the audience (like a full-on Shaw approach might do). Or maybe try alternative versions of this particular scene, one with aged Hayden and one with Shaw, and have them co-exist, leaving the viewer to choose which one to download.