• I've been looking for just such a hub and here's my list:
    Mack (according to the website)
    Goldtec (possibly?)
    Velo Orange
    Profile Design (spendy)
    Paul doesn't right now but will make some in the Spring (according to Paul)

    If you don't mind an MTB chainline:
    Surly
    Phil Wood KISS-off
    Paul ISO/fixed

    and you can bodge various generic hubs

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