Has anyone tried making new magic eye tuning indicators ? This would need glass working facilities, basic metal working equipment, and a high vacuum pumping plant.
Not a job for the average home workshop, but several people have manufactured valves by hand, and a magic eye looks no more complex than a triode.
https://www.youtube.com/watch?v=EzyXMEpq4qw
Valve manufacture by hand showing the equipment needed.
It might be easier to break apart the envelope of a dead magic eye, recoat with phosphor, and seal into a new envelope.