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I was looking at the Shimano SM-RTAD05 as a possibility, uses screws rather than pins. Definitely need something compatible with 15mm axle, as that's by far the easiest to convert for fixed rear use.
DT do a straight pull 350 with 6-bolt, so there's not much point using CentreLock + adapter if I go the hand build route, but there are more factory wheel options in CentreLock so an adapter might be needed if I can't (or won't - could be expensive) get splined sprockets.
I have a ashima centerlock to 6 bolt adapter (...I use for a disc brake) that has a very good fit. (better than the dt swiss version). No slack at all.
Worth checking out together with a velosolo type sprocket?