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The disc hub is threaded
With what thread? How is the adapter registered radially to ensure that the bearings are coaxial?
It's not a complicated part to mass produce if you have control over the hub manufacturing too, but if you don't have access to Sugino's original manufacturing drawings there's measuring and hand fitting to do because you don't know what the original dimensions and tolerances were. That starts adding pretty fast when it all has to be included in the price of a single example. There are three threads which nobody has gauges for if they're not already a bicycle manufacturer. You need to be really in love with the idea to contemplate going ahead with the project, and you need to deliver the wheel and the freewheel adapter to the machinist.
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gbj_tester
It's for a sugino 75 tyranno disc wheel. The disc hub is threaded, where you would either use a track or road screw on fitting and change the axle and spacing accordingly.
I have a carbon track Sug disc which uses the same type of hub. It's an original track wheel, with lockring threaded fitting, which must have been glued on as it's not coming off, even with considerable force, so not as suicidal as one might think. Since no one is interested in buying the road disc in current condition I'd rather keep it and convert it to track with the help of loctite and a grub screw.