Special shout out to the No One Lives Forever (NOLF) series of Spy-parody FPS. Stuck in rights purgatory for 25 years now.
https://www.thegamer.com/no-one-lives-forever-the-operative-...
https://www.thegamer.com/no-one-lives-forever-the-operative-...
That being said, I am not sure why an interested party could not make their own knock-off version of the game. The game is a parody 60s James Bond with a female lead. Would anyone care if it was functionally the exact same game, but everyone was wearing a funny hat?
You can look Freedom approach to that idea. I tried it a couple of times and as someone who had it in original way, in DOS 6.22 and wtih ESS Blaster - it doesn't click for me.