Coconut oil is better for you if you don't heat it. And it's melting point is very low. like if you take a glob and rub it in your hands it melts
really fast. I would think the friction of mixing it would melt it, or you could leave it on the top of the stove while your oven is on (when you cook your cake) and that should warm it enough, or just the counter by the stove if it gets really hot.