• thanks again for the input. bmx-flipflop-hub seems tempting. also toyed with the idea of respacing a standard 120mm flipflop hub to accomodate a 5-speed freewheel. always good to have the fixed side as a fallback option. although the fixed-side chainline will be definitely shite with the standard flipflop, but could work out with bmx disc hub.

    Only shifting in the front would mean having to alter my Crankset which i want to avoid.

    in the meantime i bought an hope RS4 hub and the ssp freehub to convert it. send it back because the new and unused 225€ hub came with a notchy non driveside bearing and a wonky freehub seal. Not willing to go that route for that amount of money.

    Got told there is a new version of the sunXCD 120mm hub in the making, but won't be available before anytime in 2023.

    Whilst searching for a good classic 5 speed hub I found a nearly-nos steel peugeot with 2x8 105sc and clearance for 28mm tires in my neighborhood. Cheaper than the hope hup or any reliable shifting-conversion i could hack together. couldn't resist, so that has to do for group rides.
    Can live with that, as its not >2000€ hanging unused on the wall like the checkpoint. also makes for much better wall art.

    so yeah, still tempted by the 3speed igh tho. or i'll use the spare rim i have now for a dynamo wheel.