As for pies, you can pour your soap directly into a pie pan & let it harden. You can make fruit shaped pieces, strawberries & such in little embed molds. After your embed pieces are hard, mist the soap pie w/ alcohol, pour a thin layer of soap on top, mist your embeds & set them into the still wet thin layer. Drizzle more soap over the top to look like gooey topping. Not sure about whipped topping.
The alcohol, as well as the thin layer of wet soap will both act as bonds to afix the fruit on top of your pies.