I've used Caswell kits and they work. As far as disposing of nasty chemicals afterwards you are on your own. If you need a cad plater try Delta Specialty Coatings in Houston. They will do one piece and ship it back but they have $100 minimum so it will behoove you to send them a box full. They also alodyne coat aluminum and many other coatings.
https://www.deltaspecialtycoatings.com/contact
I've used them for years to re-cad plate steel carburetor components. You will note that a fellow named Mike Reeder owns the place. He and I have the same last name but are no relation.