I agree that it doesn't look Moro. On the Sundang found in Malaysia and Sabah they all seems to have blades features according to the Moro, usually Tausug, conventions. So the other possible areas are Sulawesi or Sumatra.
Based on the "sorsoran" features, resembling Shahrial's Minangkabau keris as well as the strange elephant trunk, my guess is Sumatra.
Michael
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