A simpler solution would be to just stockpile a bit of food. I'm all for innovative changes, but this is unneeded. Food production is fast on the rise again across most continents, nuke stockpiles only last so long. Most smaller nations have an okay food stockpile or they raid for it, and larger nations should have the common sense to get a few weeks worth of food reserves before a war anyway. Props to you for bringing about a solution though, it was creative and ambitious, but it over complicated the matter. Credit for your efforts.
Edited for grammar