Weld a nut to the stud. Since the head is aluminum it will not stick to head. Weld a little bump on stud hold nut up and weld center up. Then just remove it worked on 3 on my bolts.
Take inner fender out and do what he said, it will work an not that hard. If u don't have means to what u need talk to friends, no need to remove head, just more work, that is not needed. Hope everything goes well for u!