SDI also has a VIS course and it is generally much less expensive. As for stickers you can find generic ones online or design and print your own. Most shops do the later which also promotes the shop. I do so for my Divers Club.
I actually took the PSI/PCI suite of courses at the last DEMA show. It includes Visual Cylinder Inspector, Valve Repair Technician, Oxygen Cleaning Cylinder Technician and Eddy Current Technician.
You can purchase alternate tools to do the work properly. You wouldn’t be the first tech to use LED rope lights to inspect cylinders.