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The HB-M525 axle has M10×1 threads to accept rear wheel hardware, and steps down to 9mm at the dropouts. Much easier to spend £10 than to mess about with saws and files. You'll may need some chainring bolt spacers to get the OLN to 100mm and with the wheel in the middle.
gbj_tester
Here's a closeup. An @mdcc_tester approved solution would be good. Walker Brothers seems like an expensive route.