I would mask off that flawless gold top with some kind of protective material. Be very careful with that finish, touching up Gold Tops is impossible to do if you want an invisible repair. I would use a very sharp, narrow chisel and gently tap with hammer to score down along the perimeter of the area and then go around and gently tap sections going down as consistently as you can to your 2 mm to make relief cuts, then carefully paring the material away. Finishing up with small sanding block should make it as smooth as needed. Good luck, I admire your determination. Projects like yours is what started me working with guitars all those years ago.
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