I also need convenience. You can still do convenience while minimizing the damage.

Most drive-thrus (other than McD's) will do lettuce wrapped burgers. Order two (or double patties) with a diet coke and skip the fries.

Wendy's also does good chicken salads.

There are a few low-carb frozen dinners available. Get those instead.

Supermarket rotisserie chickens are super-easy.

Any breakfast joint will do steak and eggs with salad all day long.

I also have a convenient regular go-to meal of boxed beef broth, 1 chopped vegetable and 1 chopped protein. Add a little Huy Fung chili sauce for the kick.