TKA is working now in Emer 3, maybe we could suggest him to write 2-3 pages with advices to run Grand Campaign, parts of book 2 and 3 had some action in Khum-Khaan an nearby areas.
In my game, we played only book 1 and a small part of suggestions for book 2. Later we stopped. My players started around level 1 and at the end of the book they were level 10-12.