I think Chokh (created by Denny O'Neil) is the first official Satellite era specific villain.
From the story line running 78-79. Interestingly he is a pollution themed villain, don't know if he or his planet ever appeared again. It's left as a warning against pollution.
I think this is followed by a string of new mostlly one-off non-recurring villains or already established pre-Satellite villains.
I think Starbreaker might be the first unique recurring Satellite era villain.
Ultraa was introduced in the Satellite era, and becomes a recurring villain.
I think the Satellite era Dr. Destiny was a pretty drastic visual and thematic reinvention from the Silver Age one, becoming a Satellite era specific villain.
I think that it's by actually referencing and reimagining the Silver Age villains, that made them the standard JL villains.