I didn't see the post you made that said the other side was cracked too. A truly skilled welder could safely weld the stay but I think you have some other issues involved. You must be one hell of a masher, don't doubt that you are and can put the torque to a frame. With both stays broken I'd rather not repair it to ride, take the components and other goods and build up a nice steel bike that suits your riding. Best of luck in whatever you decide to do.

Bill