Rishikas and Kambhojas is the area of what is now called Tazik-Uzbek. Tazik-Uzbek was called Rishikas/Kambhojas maybe 3000-5000 years ago. It was not a Persian like area then. It was proto-Vedic and Proto-Persian. If we are talking 18,000 years ago like the Zhang Zhung texts indicate, we are talking about Rishikas and Kambhojas. These names are mentioned in the Mahabharata describing the peoples from this area who settled in Punjab and what is today Pakistan (where Udyana was). This group transmitted the Vedas. According to the Mahabharata the Maharishis responsible for discovering the Vedas were from Rishikas (land of the Rishis) and Kambhojas.
3000-5000 yBP Tazik was called Rishikas/Kambhojas, at which time it was proto-Vedic, proto-Persian.
"If we are talking 18,000 pBP, we are talking about Rishikas and Khambojas."
So, Rishikas/Kambhojas existed from 18000 yBP to approx. 3000 yBP? Is there an error here, or is this a culture of extraordinarily long duration that began during the last glacial maximum ? Can you clarify, adinatha? If the Rishikas and/or Kambhojas were proto-Tocharians, they couldn't have existed much earlier than 6000 yBP (depending on how you define proto-Tocharian, or proto-Indo-European).
I think it's likely there were diverse influences that came together over time to create Bon. Possibly a Vedic influence, among others, but that would have been a later influence, if the 18,000 yBP date for earliest Bon is accurate. I think there's clearly an Inner Asian shamanic component, as well. Kalden Yungdrung, are you saying that the roots of Dzogchen could date back 18,000? What is it we're referring to as "Bon" that was practiced 18000 years ago? There was no such thing as Persian or proto-Persian back then. I think more research needs to be done. The picture will become clearer over time, with more research. 18,000 yBP, btw, was the maximum extent of the last ice age, and is believed to have covered all of Inner Asia, although some recent findings in Tibet have revealed that somehow humans were able to live there even during the ice age. All will be clarified over time.