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do you know roughly how much it might cost?
Far more than it's worth.
If you have a threaded 6-speed freewheel hub and just want to make it into a suicide hub with a decent chainline, much the best way to do it is to move some spacers from right to left and re-dish the wheel.
If you have a monobloc type wheel (Disc, Hed3, Corima 4-spoke etc.) then you already have the adapter, and nothing I can do will make it less of a suicide hub.
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.
BigH
@mdcc_tester Would you able to help us out and redraw this in a track version by any chance? Could you recommend someone who could make them and do you know roughly how much it might cost?
Thanks