A and C
Indeed perhaps it will be a combination:
1. A scarfed joint with the patch installed as a plug from the inside, and then
2. The 8 inch wide extra strips placed over the scarfed joint on the inside (glued and/or riveted in place to give extra support to the scarfed joint).
That might be a good combination.
However there might be a lot of interference from structure inside the plane (ribs, etc) to make this more challenging.
Speedbump