"When an iron meteorite is forged into a tool or weapon, the Widmanstätten patterns remain, but become stretched and distorted. The patterns usually cannot be fully eliminated by blacksmithing, even through extensive working. When a knife or tool is forged from meteoric iron and then polished, the patterns appear in the surface of the metal, albeit distorted, but they tend to retain some of the original octahedral shape and the appearance of thin lamellae criss-crossing each other."
Iron and Steel in Ancient Times by Vagn Fabritius Buchwald -- Det Kongelige Danske Videnskabernes Selskab, 2005, Page 26.
I absolutely cannot guarantee the truthfulness of this statement.
In Weihrauch's thesis there are pictures of a polished and etched weld sample consisting of 13 different alloys in layers, one of them is Gibeon meteorite. I don't know about the specifics of forge work involved. There are (among others) 100:1 and 500:1 enlargements of the Gibeon layer, and in 500:1 remains of Widmannstätten-pattern are quite well recognisable.
This is all I can say about it.
Of course the search for W-pattern in a Keris blade would mean gradually turning it into dust for the search of couple of grams of meteorite.
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