After thinking about it I think I have come up with a modification to heavy fallout that will make it more useful and keep you from having to deal with your own radiation.
Sorry, I respectfully disagree. If you launch a nuclear weapon at a city, it will be radiated, and the invading force has to deal with the radiation - maybe some anti-radiation tool?. That's the price of such weapons.
Similarly, if you use a bio-weapon against some enemy army, when you go in to capture the area, you need the antidote to protect yourself. That's why bio-weapons are always engineered in pairs - virus + antidote - together.