I'm not concerned with contaminating the salt. I have enough common sense to realize that if I might be reaching into my salt box with dirty fingers, I put enough salt into a washable glass mis en place bowl for the recipe. I'm pretty sure most of us know to do that.
If you find that you do need to dip your chicken juice laden fingers into the salt, use your clean one a la dry hand/wet hand when doing breading.
If push comes to shove, stop what you are doing and just wash your hands.
OK Missy. You just STOP with that common sense talk!!!