You can add a small amount of a butter to rebatch, but if the soap is newly made, some of the molecules still will change places. There is no way to know if all of your superfat oil or butter ends up as superfat. The problem with that is that you might get less lather and less bubbles if you add too much. With hot process, the texture of the soap is more like mashed potatoes, so it's more difficult to get the soap nice and smooth.
I would just add all your oils and butters up front and not bother adding expensive oils to the mix. Soap is a wash off product, unless you are after label appeal.
_________________ Irena Closed minds are like faulty parachutes; they refuse to open.
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