You might actually do better selling the Helicomatic freewheel, lock ring and axle innards to some Helicophile (Helicomaniac?) out there, and putting those proceeds into a conventional freewheel-hub build as suggested. A less sentimental, but ultimately more logical, application of that nice concave Weinmann.
Check out some of the $$$ Andy gets (or got) for various Helicomatic parts on the YJ site.