Here a drawing of a possible solution for building in the overrunning clutch.
I checked the catalog from Formsprag.com and found that they have clutches in the 6200 series of bearing dimensions.
So if we take a CSK 2RS 6206 than this size fits like in the upper part of the cross section. The lower part is the standard cross section. By welding a piece to the center and turn it on a lath the overrunning bearing and the support bearing (6006.2RS) find their place.
The aluminum cover - green in the drawing- needs some additional ring welded to it and than machined.
Also a new (brown) ring is needed with the rivets to connect to the drum. A special nut with an extension is also needed.
If there is enough interest I will do the version with dimensions on it.