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				Do you don't think that it is possible to bore out the rivet and take off the hilt?
			
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 Sure, the hilt can be taken off! (I'd kinda question the expertise of a bladesmith who needs to destroy the hilt for working on a blade...  
  
 )
Also, correcting an slightly bent blade (I reckon this is a somewhat even curve from your description?) should be possible to do without bringing the blade up to red heat and needing to harden/tempering it! Even kinks in a blade can usually corrected for without resorting to a forge. I think you need to talk to someone experienced with restoring antique swords (like Philip Tom) to get some pointers.
BTW, I'd like to see this kampilan blade etched - looks like pretty good work for a current era smith! (Neat reproduction - not suggesting this is an antique.) What is the maximum thickness?
If you really want to upgrade the hilt for a user blade, take care in selecting the new hilt - some of the Turgaya hilts look a bit cheesy IMHO. 
Regards,
Kai