Bingowings said:
It might make sense for someone to attempt a Force Ghost huddle at the end of ROTJ where the older incarnations of Anakin, Yoda and Ben grow young.

That way Seb Shaw and Sir Alec (and Frank Oz's hand) get to appear but if these new episodes use PT actors as Force ghosts the continuity still stands.

I put this idea here because PT regulars might spot better Hayden and Ewan shots for Seb and Alec to morph into than the existing SE Hayden and Ewan needs to be picked from scratch.

Maybe there is material in the making of documentaries or deleted scenes where Hayden doesn't look so Gary Glittery.