They've been doing that for two decades. Golden rice could have saved hundreds, if not thousands, of lives by now. Especially the later versions we're on now. Hopefully it doesn't violate the self-promotion rules for me to link an article I wrote a long, long time ago on Golden Rice 3.0 and its improved benefits.
I haven't kept up with the project since, I wouldn't be surprised if we're on 4.0 or beyond by now, the scientists involved have been working tirelessly for years to make the rice even better and more beneficial for the people who need it.
And anti-science idiots like Greenpeace have been fighting them every step of the way.
PugJesus