It takes 7-10 kg of plants to produce one kg of meat, so you're causing that much more suffering even if you are willing to claim that plants suffer as much as we do from pain.
Then we just need to feed the animals their natural diets instead of the abnormal, unnatural diet of grains and soyabeans that most factory-farmed animals are currently fattened on.
Solution doesn't seem that difficult to me.
If we do that then we can all eat meat about once a week. And anyway the ratio of plants eaten to meat produced would be about the same so no gain there.