Definately reduce cooking time. See if you have any recipes for mini fruit muffins and check that temp and cooking time as it will be very different to the whole cake. I am not sure it will keep so well without alcohol. It would keep just like normal fruit cake I would think- a few weeks? Can you do half alcohol and half fruit juice? And when you soak the fruit overnight in the alcohol keep a cover off so the alcohol evaporates. Or you could make up the full mix then divide it in half and bake a smaller whole cake with alcohol for yourselves and some mini ones for DS?