"The entire population" doesn’t want to eat only beef and drink milk, however those are way more subsidized than other food. The real winners are food mega corps and a few rich farmers.
Remove the targeted subsidies and "the entire population" will eat less meat and more peas. Subsidize the peas and not the meat and you’ll see vegans skyrocket.
Then how about the people with this moral preference subsidize pea farming and run the experiment on their own dime? How big are these subsidies for farming on a per-capita basis?
If it's too much you could do it for a smaller area ...
Remove the targeted subsidies and "the entire population" will eat less meat and more peas. Subsidize the peas and not the meat and you’ll see vegans skyrocket.