Using modified scripts from Cleveland Rock and anno1404, I've put together an empty Fortune City template that runs all the way to day 5 (firebombing) without any zombies. This version conveniently starts you outside the Arena, and grants the map/transceiver as well (cMissionDefinition Zombrex1). Spawns the High Roller mission with a call for it as an easy way to farm money (cMissionDefinition High_Rollers). Otherwise, this is a useful empty template for modders.
Back up your missions.txt in datafile.big, and replace with this version.