I was just wondering if you can grate the soap and when you start melting it, can you add other oils or shortenings? I want a soap that is VERY oily for this dry skin of mine. If I grate it and then I want to add some shea butter or some castor oil or olive oil to the grated soap when it's being melted, would that be alright to do? That way it would be superfatted. But didn't know IF it would be OK to do this or not with remilled soap.