What you are really talking about here is not `alternate meat' which is a solecism, rather ` a vegetable derived substance that simulates the texture and taste of meat'. Now that is rather a mouthful of adjectivity, the best solution to which is to coin a single noun which describes the actual stuff. I submit `MERTF' as my substitute noun to describe vegetable derived substances that simulate the texture and taste of meat.
By rhe way, the bloodcurrdling screams of every carrot I have ever slain yet resounds in my dreams. Rurhlessly yanking them headwise from their pleastant earthly (somewhat necessarilly) diirty abode! I tthink I may have PTSD. Vegetable slaughter by the tens of thousands ! Forced as a child vegetarian solidier to shuck them peas, husk them corncobs.! Oh the humanity! Oh the vegetablility! And I haven't even started yet on the biowarfare waged against viruses!