I think this would be the way to go. It's been done for other lines, for example AFMBE. They've gotten a lot of distance out of putting zombies (or zombie like things) into different settings and genres. Basically they just lay out a description of the genre, give some pertinent rules, and then 3 or 4 adventure/campaign settings that showcase various flavors of the genre (the kung-fu book, for example, had John Woo gunplay, Wuxia, Big Trouble in Little China, and Mortal Kombat type settings. All with zombies!)