Coconut and vanilla extract?!? You mean the stuff in the supermaket in the baking section? What does it taste like? I poured Lime essential oil into mine.
I have recently melted four VDH pucks into separate Pyrex(with plastic covers) storage containers. In each I added a different fragrance oil, Lime, Bay Rum & Lime, Brut and Cool Water. They all smell wonderful and lather just fine and the bowl covers keep the fragrances home.
I am not sure of the feasibility of adding anything other than soap quality fragrance oil or essential oils to your soap.
I have been making cold process soap for years and have not had any problems with fragrance oils purchased from reputable soap supply online outlets.