So, I am not able to get a good picture, but the sliver, of the old bolt, that I can see is inside the hole. There is nothing protruding. It is just a tiny piece and is a bit shinier than the aluminium bung. I will see if I can get that part out, without buggering it up anymore. If I am successful, I might try the JB Weld, as is pointed out, there is not a lot of stress on that bolt. It just holds the lower fairing close to the Delta Box frame. I will take pictures if it turns out ok! Lol
This gadget (pix below) is called a Nut Plate. If you simply drill out the old hole, large enough to accept the nut part (flush) with the metal surface, you are almost home. Drill and tap two very small holes (or use tiny self-tapping screws) to secure the two "ears" on each side of the hole. Done deal.
If you are a fanatic, and careful, you can use JB-Weld to help secure the Nut Plate into the drilled hole, besides using two small screws.
Nut Plates come in all shapes and sizes. Typically they hold machine screws of various threads and diameters. The picture shows a "friction-locking" item, so you can install the right machine screw and it will not work itself free. Pick the machine screw you want to use, and buy the nut plate to fit that machine screw as to size and thread.
If you need a source for such hardware in the USA, "Nuts and Bolts" is a separate heading in the Yellow Pages. The real (not a wannabe) Yellow Pages on the Internet is:
Go to Find a Business, type in the heading you want, and give any local ZIP code. That site will SORT the results found by the distance to that ZIP code.