JPEG Ji
It is very fascinating to read your posting. Although I'm NOT a history major, I've been learning as much as I can. It is obvious that you have some in dept knowledge of the history around the Indian sub continent. Would you be kind enough to point us some book to learn about the history of earlier people in Nepal itself, mainly Kathmandu. Do we even have books, is it a guy's theory printed by Ratna Pustak Bhandar or are they backed with proof.
Since I'm an enthusiast, I have no patience to know any history of any place unless there is a significant achievement at the time period in terms of science and technology. With that in mind, I did read a book about Harappa and Mahenjo-daro, too much unnecessary info for me. It might be a gold mine for you.
I've got few question regarding what you've written so far

1.Was Harappa and Mahenjo-daro only settlement in Asian continent. As proud the Indians are of their history, Chinese people brag about their history too, all the way to 5000 years. What about Chinese people around that time. Are you implying Chinese people are the descendant of the Harappa and Mahenjo-daro people?
2.Where can I see the artifacts of Harappa and Mahenjo-daro people? Are they in India?
3.The artifacts found in KTM dating back to 9,000. Where is that now?

I do agree history and archeology can be written by a race in their favor and hide the real truth. Evey year there is a new discovery of newer civilization. Nothing is true until backed by science and scholars(not just one).