Hello ashkenaz,
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				I've been looking up the connection between the Modern/Military/Recon/Marine Ginunting to the more heavy and "traditional" Binangon/Ginunting Bolo as well as the story to how the Modern Ginunting came about and transitioning from the old Ilonggo one and who exactly made the modernized modifications.
			
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 So, what have you found out already? 
This seems to be a fairly recent development within the Tortal/Gaje lineage. I'm not privy to any intimate details but you can always ask the source, I guess. 

Please keep us posted!
From what I've seen there is quite a bit of variability of antique Ilonggo binangon/ginunting (i. e. with klewang type blades) from Panay/Guiramas/Negros: If there is any trend at all, the longer, "pure" fighting blades may be a tad slimmer on average?
I haven't come across any antique examples with original concave edge (nor noticeably protruding tip) though; however, there are genuine klewang with resembling features from other (non-neighbouring) origins.
Regards,
Kai