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Once road discs become mainstream it could happen
Not for loose rims, mostly because loose hub makers aren't likely to go sub-24 for disc brakes. There are factory builds with 21 (14:7) and 20 spokes, and 18 would be possible as a 12:6 build with very deep rims, but I can't see components for handbuilds going that low.
20h disc brake rims, there is a reason why no one makes them it is a niche market of one.