Try to buy special liquid from CT, which is used for fixing the brocken rear windows defrost line. It's kind of glue with lot of fine copper powder. It comes with a small brush, so that you can draw on this line. After it dry, it will stay there firmly.
I forget the name, you can ask sales man about rear windows defroster line repairer.
The only garage that can repair (welding) is the dealer or Lebeau. I suggest you to go to the dealer. It should only cost you about 1 hour labor.
A friend of mine had the same problem and the dealer broke the glass while welding (because of the extreme cold and heat) - they replaced it free of charge.