Mabagani, this is not to discount anything else you stated in your post, but, as i am sure you know, "flame daggers, blades with waves" are NOT the identifying element of the keris or kris. The oldest known keris are not, infact, luk blades at all, so the fact that Greco-Roman culture used them does not necessarily imply any real link to the development of the keris
Is it possible? Yes, of course. But IMO, yes a stretch.
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