Hi Silverwook:
Can you track down that guy who did buy the Ewoks movie films and ask him if he would like to participate in a digital film preservation project?
https://www.bd-cine.com/fiche.php?id=16318
Those films will deteriorate and be unwatchable eventually and then no one will be able to get an HD version!
But, not like the SW holiday special. That SW show must remain as an obscure DVD fan preservation for the sake of humanity.