I think I remember saying this in another thread, but a respecialized ROTJ would be almost identical to the HDTV SE. I’m pretty sure the only changes between the 1997 and 2004 versions are ghost Hayden, the Naboo shot in the celebration montage, and the insertion of the Jedi temple from the PT in the background of the Coruscant shot.
As for ESB, Adywan’s 1997 reconstruction does the trick.