I have heard that breeders of other snake species often keep one or two kings as "garbage cans", so as to not waste things like refused meals and even babies that don't make it!
From what I have read, their care is almost identical (except maybe a slightly larger enclosure, depending on the species).
If all you have is corns, why not try something new?
Best of luck!
Mine will eat anything anytime, I feed her everything that my others leave behind. No waste in my house .
To quote Nanci, " Everyone should have a Garbage Disposal Snake."