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@gbj_tester
Any 130mm PCD road cranks (FC-4500, 4600, 5600, 5700, 6600, 6700, 7800, 7900) plus USE chainring gives ~42mm chainline. Very bling, but the rings are £109 each. Bolting a 3mm thick 130mm PCD track ring to the inside chainring position on any of those cranks should give ~40mm chainline, use single ring bolts or double ones with 2mm shims to replace the outer ring. Not very pretty, but it will work. Some of the burlier track rings are 4mm thick, which will move the chainline inboard a further 0.5mm. Using a track ring in the outer position moves the chainline out to about 47mm, which works with some track hubs, e.g. older Goldtecs, Mavic Ellipse, Shimano road wheels with Surly Fixxer, and also converted front disc hubs re-spaced sideways by 5mm to make the wheel build dishless, or very nearly so.