Replacement of grip plates is  not only possible, but is quite likely: organic materials do not hold as long as metal parts. 
 
Elgood, in his description of all-metal Indian daggers, specifically mentioned their indestructibility. 
 
I have a khanjarli, also likely 17-18 century,  with dried and shrunken bone grip and  broken off fragments. 
 
Some of the current Forumites, myself included, can also boast such “ kisses of time”:-)
		 
		
		
		
		
		
		
		
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