No. Monsanto is interested in you buying their specific GM feed corn,
engineered for your rough global area (up to and including country-scale or
larger). ALL of your feed corn, as well as their glyphophosphate
herbicide. And so it goes, for every GM crop and its proprietor,
human-edible or not. Their products cover vast swathes of cropland.
Nor are many modern GM crops really appropriate for a "disaster-proofing"
setting. What, exactly, is glyphophosphate-resistant corn going to do for
anyone, in such a situation? You apparently have an inflated impression of
GM’s actual uses. Most disease resistance, for example — in fact, nearly
all — comes from traditional breeding and/or splicing methods, not GM
techniques, as well as most increases in yield.