One way to prevent a bunch of errors from the now missing meats is to use this mod... Perfectly Generic Item

Using this method with a very late game save produced no errors, although all cooked meals now used "Perfectly Generic Item" as an ingredient replacing the missing meat.

These meals can still be eaten by pawns but will be completely useless. My pawns didn't get any nutrition from them when testing whatsoever so they ate through the whole lot of them quickly. If you don't want to enable dev mode to replace the meals just be ready to have your chef replenish all the now useless meals.