They make speedy sleeves in all sorts of diameters. We used to use them as a repair for a worn shaft but the manufacturers started using them from new since it is a replaceable sleeve and will protect the shaft from possible breakage after extreme wear situations. They are installed with a correct diameter and length of steel tubing and we use a dab of Devon plastic steel to set them. The driver flange can be removed or left in place if it doesn't interfere with the seal.
I'd check into sizes and see if there are any that would fit. Here is a link to SKF sizes.
https://www.oit.edu/docs/default-sou...g.pdf?sfvrsn=2