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two ISO disc mounts, but that's quite a niche.
There are some 110×20 hubs with disc mounts both sides, but they are too close together to work in a 142mm frame, even with 5mm shims both sides. Double IS 6-bolt and 24h straight pull is a match made in heaven for a designer, but there isn't even the market to support it in track frames, never mind any of the 8000 "standard" freewheel hub widths.
gbj_tester
Could work. Would quite like to use both brakes. Ideally it would be 12 x 142 and have two ISO disc mounts, but that's quite a niche.