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The beneficiaries of this charity would eat more food than they otherwise would (assuming the charity targets really poor people), and more of it would be vegan, percentage-wise. Since using good, affordable and nutrition-complete food would be an explicit goal, donations would have the welcome side-effect of incentivizing such R&D, as well as scale economics.
I think this is a general argument for eating nutrition-fortified vegan products, but they tend to be high-cost organic life-style products, and I'd prefer to help make them ready for affordable mass consumption.
Opportunity costs if it's not optimal. Then there's the argument from wild-animal suffering and ecosystem displacement, that is, that meat consumption helps destroy the environment faster and therefore prevents more animals from suffering. And speculative acceptance problems or PR backlash if, say, the food isn't healthy. Also, you would need to identify people who really benefit from free food and bring it to them in a cost-effective way (I figure malaria nets don't spoil as fast as food does.)
Perhaps there could be a niche for this in disaster aid or acute famine relief.