While I think it is commonly seen that there is no “blacklisting” for those who overstay their visas for less than a month or two, still the question arises as to whether you can be PROCESSED OUT at the CKS Airport, or if you have to make some special arrangements at the Foreign Affairs Police Station in your city/county of residence.
After considering this for some time, I have come to the following conclusion – I suggest going to the overstay counter at the Police Station within 48 hours of your expected departure, with plane ticket and overstay fine in hand, and say that you carelessly overstayed your visa. Then you can fill out a form and get a few chops, stamps, etc. there, and since you have a plane ticket in hand which will get you out of their hair within 48 hours, that should be the end of it.
However, as far as what the reaction of an overseas representative office might be, since you may want to apply for a new visa in the future . . . . . . . . well, I have no idea about that . . . . . . . .