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Doh, sorry, missed the fixed hub bit.
Edited to add: On my singlespeed wheelset I replaced the front Mack hub (which failed spectacularly and catastrophically) with a RAF12. The rear Mack hub (a Superlight low flange version) has worked fine and looks very similar to the RAF12. Not the same manufacturer, but you'd need to be eagle-eyed to spot that, so that might be an option. Bitex do make track hubs, but they're of the traditional high flange, waisted hub variety and wouldn't match any of their geared rear hubs, so you couldn't have a front hub which would match both.
That’s hugely helpful, thank you. I’ll look into those hubs now.
The fixed hub won’t be a disc brake hub though. I won’t be running a brake on the rear.