I came across this deepfake video today from Return of the Jedi. It adds Hayden as Vader on death star. Its not a perfect job, but the idea is there.
If anyone should be deepfaked into the role of unmasked Darth Vader, it should be David Prowse, not Hayden Christianson. for all those that were looking forward to it happening after that Documentary a few years ago, its something I’ve been working on myself oddly enough. Not far into it but its looking promising.