My idea is to cut out a 1-foot square hole where the damage is. Then I'll make a 1-foot patch out of wood or wallboard and hang it inside the hole with wooden supports (this was suggested to me by a friend.) Now I'm wondering how to camouflage the patch. Can I use drywall tape and spackle/plaster to hide the seam? Can you buy small amounts of the texture to brush or spray on the smooth patch? I expect the patch will never be invisible, but I'd like it to be as unnoticable as I can.
Any advice or suggestions would be greatly appreciated.