What if Darkseid appeared in Christopher Reeve's Superman universe?
DC is apparently, inserting Darkseid into the Superman '78 comic:
https://pbs.twimg.com/media/EvfxnD1WQAMHbZD?format=jpg&name=small
I in my head, imagined that Skeletor as portrayed by Frank Langella in the 1987 Masters of the Universe movie (which like Superman IV, was produced by Cannon), was the closest thing that we got to a live-action Darkseid of that era.
https://moviechat.org/tt0094074/Superman-IV-The-Quest-for-Peace/58c74b886b51e905f6742425/What-if-Superman-shared-the-same-universe-as-Masters-of-the-Universe