Outsource it to someone else who cares about the oot which is not currently Lucasfilm. It does not even have to be funded by Lucas just license it to whomever.

Have the restoration done by Bob Harris.

Have restoration prints run in the cinemas, then have a blu ray/DVD release simultaneously afterward.

Lucas and Lucasfilm would still benefit in terms of royalty profits, let someone like Fox pay for the restoration, they apparently paid 20 million to restore star wars trilogy in 1997 which was ultimately changed and not restored.