Most Ortho labs are set up already to be able to provide this service to general dentist doctors. You may not know how to do this yet, but maybe after this video it will give you an idea how to do this. You will need is some cold-cure denture repair acrylic. I get mine here: JBC and Company.
If you can provide this service in a one-day or half-day turn around time you will have one popular lab with local dentists!