Willy44,
I have seen this done professionally on boats over 30 feet with some good some bad results. The problems are,
You normally have to trim the mast, making the mast shorter, meaning all standing rigging and sails will need adjustment or changeout.
Unless the repair is at the bottom of the mast, the sleeve and epoxy will add weight aloft which affects the balance of the boat.
The sleeve creates a 'stiff' section in the mast which concentrates stress and can lead to mast failure in a heavy blow.
I would suggest you look around for a used mast with similar demensions.
Brian Lowman
S/V Gypsy Rose
