Thats basically how we planned the old one QV. Just we picked the system, instead of having a set list of what next. If Coalition won last fight, or is still stuck with only Theta, than they pick next location. If Alliance won last fight, they pick the next location. Doing this until the events end.
And Nightfall, theres nothing wrong with a little preperation. Then you can alter it, instead of starting from scratch later on.