More than mostly
I think we are actually splitting hairs. Again I am stressing for that time (meaning 1950's America). I think that the limited knowledge that the Beats had on the subject did influence many people to do their own reading, research, and practice.
One of my favorite aspects of Kerouac's work is his struggle with this issue--trying to work Eastern ideas into the West and his life. To me his failure makes for some great writing and great insights. I still would have liked to seen him find more answers and less booze late in life.
Also the Charters bio still focuses a lot on school and OTR and his death. I agree that she doesnt seem to have the agenda that others do.