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@gbj_tester
Proper bike tarts make new axles when this kind of question arises :-)
I have tapped aluminium alloy front QR axles for M6 screws, strictly speaking the 5.2mm bore of your axle is a bit bigger than the proper pilot hole for an M6 tap, but then keeping rim-braked front wheels attached to the bike isn't a stern test. 12mm of thread engagement and 5Nm tightening torque would be the kind of suggestions somebody minded to suggest such a course would suggest, not that I'm suggesting any such thing.