As im too lazy to read the entire thread, i will consider that someone has said that a welder will have that fixed in a jiffy. Or you could buy a cheap welder and do it yourself- though you mentioned you were into cars, so owning one of those would be very handy and save you money in the long run, and if not then its a good 'boys toy' to own
Even a simple 'tack' weld is really strong, and i mean really really strong. And while it might not look nice, a quick spray off the rattle can, will have it looking reasonable in minutes.
Safety on a bike is more important when it is the front end. I have seen bikes , wheels, stays fall to bits during races and the rider was fine. The only thing any cyclist needs to know is if the front end goes, its pain time.