[walkingfish]

I think I understand your question a bit better now. You are not trying to create a product that tastes like meat or has the consistency of meat. You are trying to create a nutritionally balanced plant-based food that can simulate meat in the way it's processed metabolically by humans. This is a different goal. Adding the ability for the plant to produce B12 would be a start. Such an ideal "super plant" should contain all amino acids needed by people.

As for how to do this, I have no idea. What you're proposing is very complicated, and beyond my scope of understanding.