Hi;
I have a game that has the delaminated plywood at the base on 3 sides and my only option is to repair, not cut it out.
I had done some research and found several epoxy products that are used for repairing landmark homes, wood repair that is.
It would require you to basically build a small form, then pour in the epoxy, which would become one with the existing wood. Some sanding and refinishing and the repair is then stronger that the original wood.
I have not done this yet as life has taken over for now but if you need more info, just do a search for epoxy wood repair and you should be busy for a week or so.......
Jeff