In bikes, as in shotguns, I could not find precisely what I wanted so made my own cocktail- titanium Merlin MTB frame, 1X8 gearing with narrow-wide 30T chain ring before the setup became fashionable. Total weight 22lbs.

Wish I could do the same by joining Darne barrels (the ones minus the bottom rib) to a Dickson non ejector side pedal frame.