You can differentiate for letters and sounds. Do you have a TA? It means you and your TA swapping focus groups when there are 2 groups not working with an adult they can do practice work alone. Magic bags can be done by a sensible group, phoneme spotters can be done independently. Look at mantle of the expert for some ideas how you can cover the curriculum with a creative based approach - I have not personally used it but I am desperate to try. I also feel that mantle of the expert can just help you 'think' how to teach the skills in a creative way even if you are not following the method exactly.