Ultra Bee Rear 90/90-19" Off Road Tire

This set up of the tube not having a lock is very bad. My son who has disabilities loves his bike but when he changes tires it results in blowing through 2-3 tubes and travelling costs of 200.00 + as we have no dealers repair facilities here on the sunshine coast. It's very frustrating. Is there any advice on how to change tire without this happening. It shouldn't be this difficult 😪