Is the purpose of the jam to create a new subgenre for the game, like spaghettipunk in which everything is spaghetti? I wouldn't do spaghetti punk, but that was the first thing that came to mind. Are we allowed to use existing -punks, like solarpunk or the ones you've listed?

Make up your own cyberpunk/steampunk derivative and use the ones I’ve listed as a reference. This might also help: Cyberpunk Derivatives Wikpedia