I can try to repair your singing bowl.
But I can not promise that it works.
Sometimes the crack after soldering is bigger than before.
It costs 30, - to 50, - € and shipping.
If I shoud try it, you find my adress on my Home-Page
I can not say much about Balinese gongs.
But I could show you how you can even forge a gong, which is similar to a Balinese Gong.