Or even better, replace Shaw and RotS Christiansen in RotJ with an aged up Christiansen. Shaw looks and sounds nothing like Anakin at all and should be removed from every version of the films, including the unmasking and especially in RoS:A.
Isn’t this what we ended up doing for this edit? I can’t remember. It was either discussed or implemented. Because to me the Anakin ghost does look aged up a bit via Faceapp. (Come to think of it I’m pretty sure it’s just the light levels messing with my eyes).