Until I saw you work in a school, I was going to suggest you looked at school shoes ! They often have different width options and many styles are smart but inside padded like trainers for those kids who have long walks to school and back. But as you work in a school, you run the risk of hearing “oh miss you have the same shoes as Izzy/Elly/Olivia!” And cause social death for that poor girl.
Obviously if you are the cool teacher everyone wants to be like when they grow up, go for it. (Also works if you work in early years and/or an all boys school.)