hmmm...I personally cant see JBWeld holding up to it. Its some good stuff but adhereing to a flat surface like that with such a small contact area I just dont see it being very strong. Not to mention trying to figure out how to hold all the studs in place while the stuff drys. I would try a test, JBWeld a bolt to a spare piece of metal or the old CP, Once it cures bang on it a bit and see if it doesnt pop off. I could be wrong on this one, and the stuff does hold good, its just the relatively small contact area and the fact that they will be subjected to side forces that makes me dubious.
You didnt say where you are located, perhaps someone here is near you with some welding skills (ie, if you are in NJ PM me and I can weld it for you)
You could braze it also which is somewhere between soldering and welding on the strength scale, but again you would need someone who could do it. Check out local radiator shops, they usually have brazing equipment and might do it cheap.