Modified plant proteins like Beyond Meat and/or the kinds of organisms you describe seem to be a much closer, easier, and more likely near-to-medium term solutions. And I say that as someone who would love nothing more than for lab grown meat to succeed and someone who has made a variety of sacrifices and to both eat less meat and when I do eat more sustainable and ethical meat (to the satisfaction of my own personal morals).
This is the first use case I've seen that makes sense.
Other types of meat that make sense are high end sushi fish etc. where again the conventional price they compete against is high enough that it makes it economically possible to grow it in a lab.
[1] https://www.theguardian.com/environment/2023/mar/28/meatball...