Take a look at the VXB offering for sprag bearings https://www.vxb.com/One-Way-Bearings-s/231.htm The outer sleeve is integrated, but most require an inner sleeve. There is one that has both and looks like a normal ball bearing. I'm guessing the major bearing manufacturers have offerings that would work. Maybe check with your local bearing vendor.
I have seen sleeves that might work for the shaft. Grinding your own would be pretty easy if you had a cylindrical grinder but without that it might be a bit tricky. Maybe could be done on your machine, but would require an interesting setup.