OK this got me looking for a Buddhist connection between Aceh and Tibet and I found this.
From THE MYSTICAL WORLD OF INDONESIA, Allen Sievers, the John Hopkins
University Press, Baltimore and London, 1974
"Shri Vijaja on Sumatra was a centre of Buddhist
learning, attracting students from China and India, exporting texts
and exerting an influence on Tibet. "
Shri Vijaja (Shri Vijaya) was also prominent as a trading partner with China from the 7th cent. until it was conquered by the Javanese.
Still all very circumstantail and not proof of anything I know
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