Good luck to you, Alex. Some seeds' seed coats separate easily, some don't. it won't be an easy task with such a hard seed coat. I think I would first sacrifice a seed and cut it in half, then see how easy or difficult it is to remove. Some seeds have a "skin" between the outer seed coat and the embryo that can aid in the separation. (Think of a peanut.) Sunflower seeds have this, too, but it's so thin that it is hardly noticeable.
