Since you have cored structure you can have some success with thermal imaging. In the solid regions you might be able to use ultrasonics. Suffice to say these methods require extensive expertise well beyond the capabilities of the average builder. You'll have to bring in an NDT consultant to do the work, and it will be expensive, and not conclusive.

Once you determine the scope of the damage you determine the type and scope of the repair. It is certainly possible to affect a local repair, even one this extensive. You'll gain a little weight, which you'll have to balance in the other wing, but it can be structurally and cosmetically sound. I can help with the design, and I'm guessing Dan Newland would be willing to help as well. There may be other composites experts on the list I don't know about.

My recommendation, on the face of what I saw in your pictures, is to seriously consider replacing the wing.