My guess, based on the little I know of metallurgy, is that the only way you could conclusively identify meteoric material in a forged blade is by atomic analysis, which means cutting a piece off the blade and looking at elemental composition and the isotopic ratios of the elements present.
Even this wouldn't be conclusive, because I don't think an entire Kris would be made of meteoric iron, simply the lighter colored layers, and even these might have been amalgammated with terrestrial iron to make them workable.
I have no idea how much metal would be needed, but aside from cutting off the tip of the tang, I'm not sure how you would sample much without seriously damaging the blade. Nor am I sure how much it would cost. It's the kind of thing where I would go to a university geochemistry (or materials science) lab and have a long chat with a professor about departmental donations, papers, and the like. Someone might be receptive to testing a number of "meteoric" blades, if the money was there at the beginning and the opportunity to publish a paper appeared at the end....
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