Simple posters, in blue colour way, with a rhyme describing magic 'e' and, the alternative term used in some schools, bossy 'e'. Clearly laid out with examples for each vowel. Available in a choice of fonts.
Set up a "homework options" chart. Maybe put a weekday at the top of each column, allow them to choose from that column. Staple to the top of all completed hw on Friday, with their choice for each night colored in/signed.
A Day in the Life of a Child With Sensory Processing Issues