The PPL is OK for a License to learn and the syllabus is just enough for 90% of the pilots.
The problem is that you can setup advanced courses but nobody wants to pay for them.
There are no books on going "international" so people come on the forums and ask for advice.
Maybe that could be your next project Peter you do seem to have a flare for writing these things up. Then publish it on a Kindle or as an ebook.