This might seem a bit off the wall, but here goes: How about making a cross cut just above the damaged area to a depth equal to the depth of the damage. Remove the remainder of the wood down past the damage with a dado blade on the table saw or with a band saw. Cut a new piece of material to match the area and glue it up. Make a "detail" groove where the new piece meets the old. Next, make a matching detail groove on the other leg, so the repair is less apparent. Matching the finish should be straight forward.