No need to apologise Figarow, it's just that you and I are both grinding our teeth over the wastage of your time and materials.
First, to run successfully the crankshaft extension has to be smooth. Some narrow, perfectly circumferential remaining grooves probably won't do much harm, since the amount of bearing area is not important here - this isn't a crankpin.
Second, I think you will need to take the new clutch apart to see how much damage has been done to the balls, sprags, and outer housing. You also need to inspect the bore of the sprag housing, where the crankshaft extension runs inside it, to see how torn up that is. I don't think you can repair it if it is damaged.
