I have a tumbler but thanks. I read online that they don't really work to get cerakote off.I've used the berrymans I linked above. Worked great. Used to get sold at every auto parts store, not sure if it still is. Gunk is probably similar.
Do you have a vibratory tumbler for reloading ? If not, do you want one ?
For small parts they can do a lot of what blasting does. Just slower, with less work.