I like the idea, though the implementation would be much trickier in Civ V's world congress system (random topic with A/B and targets) than it would have been under Civ V's system of resolutions chosen by diplomatically powerful civs. Perhaps the target free city could be pre-chosen (as there likely won't be more than one at the time of a given congress meeting) and choice A could have sub-options for each city state type? I'm not sure what option B could do under that scheme, though.