I wouldn't be too worried about the fit of the bearing bore to the spigot OD being a bit sloppy. It just locates the bearing's inner race with respect to the clutch discs, but it is not involved in the actual transmission of power.
The face of the shoulder on the spigot, against which the bearing's inner race bears, is the critical surface there.
What does concern me, is the excessive end play resulting from the axial wear of that reverse spigot shoulder face. This is the wear I reckon needs to be shimmed out, so that the pedal linkage/yoke can apply sufficient pressure to the reverse clutch disc to prevent slip. 35mm ID shim washers can be found, either through bearing suppliers, or from 'Precision Shims' in Vic.
The only other way to fix this is to replace the reverse clutch disc, or have the shoulder built up by TIG welding and re-machined.
