Ariel, since you mentioned it yourself. 
In Hindu Arms and Ritual Robert Elgood, in chapter 8, shows a Gana (arms bearer for the great gods). It is from a cave temple and said to be from the  7th century. The relief shows a Gana holding a very kukri like knife. 
In the same chapter he shows forward curved swords from the 15th and 17th century. 
Is the Aydha Katthi a reminiscence of these blades? The Sosan Pattah is likely to be.
		 
		
		
		
		
		
		
		
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