The practice of brazing cast is older than I am, and believe me that is old. It will work out with no problem. If on the other hand you want to weld it yourself, you will probably fail the first time out unless you have had a lot of experience. A good welder can do it with several types of rod available in the USA, but most welders would opt for the brazing instead of welding. Many years ago I used a silicon bronze rod and TIGed a casting for a foreign Transmission because there was a several month waiting period to get a new casting. It was still working the last I knew. Good luck and let us know what you do.
God Bless
Frank