That sucks, I'd go weld it because JB wont' hold up. It wont even hold up on the tiniest leak I have and it's 1 hairline, I need to replace it monthly, I can't get mine welded because it's the center res of the bosal, just the rolled steel separated on impact the tiniest bit, not bad at all.
Get it welded and smile at the results, or sell it and by a flange fit bosal