Maybe ressistance mode? Open world city and you play as a ressistance soldier that start with no notoriety. Work together with other ressistance to free France. Gather information for the allies, sabotage German supply lines to help allies war effort, kill important German military personel (like officer), free prisoner of war, steal weapons and distribute them to other ressistance, and many more. By doing those actions you can help the allies to liberate France but also gain notoriety if seen. The SS will surely eliminate you if you are in there wanted list. You won't enter the wanted list if you conceal your identity.
You can also be a ressistance leader and conduct raid. Ressistance bases can be made anywhere and need to be defended.
Is this a nice idea?