"Do you think he can do clay baths prior to getting his amalgams removed?"

Yes, however I am skeptical about them. They might not do much good. Some people here like saunas and steam rooms, however in addition to getting rid of some toxic metals, they cause the loss of plenty of necessary minerals. I guess they are okay if one takes extra mineral supplements- magnesium, calcium, zinc, etc. and eats plenty of potassium and sodium rich rich foods and drinks plenty of water.

Make sure that the turmeric you get has not been irradiated. Irradiation damages some of the medicinal properties of turmeric.