How Would This Even Work?
To make this happen, countries around the world would need to cooperate in ways we have never seen before. Every nuclear state would have to agree to hand over their weapons to a neutral global organization, one managed by respected scientists, engineers, and peacekeepers.
Launching these devices would require newly designed rockets built to carry dangerous radioactive materials safely. Each warhead would need to be placed in a shock proof container that could survive accidents or attacks. Since any failed launch could be catastrophic, the rockets would have to lift off from a remote area far from any cities.
There is another major issue. For technical reasons, each bomb would have to be armed and ready to explode during the launch. That means every single takeoff would carry the risk of global disaster if anything went wrong.