I had a simular situation except I discovered before I put on the wings.
I however did not build the wings, I purchased them from another builder who changed his mind about building the 7A. One wing ok, but the other I had to fix.
To fix the situation I drilled out the rivets and installed a new hinge. It really was not a hard fix. It took a little time but better than I thought.
Best to you, you will get it.
Dave