There is something to the statement "we fly all over the world" .
If there was one global ATC readback requirement booklet that we could all learn and then apply everywhere it would be simple. I think most international pilots just come up with their own set of things that they will read-back that cover them in 99% of the places they fly. I know I used to do that with POB and qnh when I was flying into places where about half wanted it and half didn't.....I just gave it to them all because at that stage my priority was learning the new jet I was flying. Now that I have that squared away to a degree I devote more time to the little things. It's impossible to know it all in this job. (Not saying you shouldn't try)
Framer