Up to you brother. I didn't check the states on packing.org for SC so I don't know if they have a non res permit. Most states (all?) will translate a res to a non resident with a simple address change. I am so happy that I did what I did when I did it for one move of mine. I got my permit about three months before I moved, and it had good reciprocity. More importantly, it transferred to a non res with a phone call. BTW, it is from one of the hardest states to get a CCW (not an "impossible" eg CA, NY) but difficult. My vote is do the SC if it has a non res. If not, punt until you know for sure. It will be irrelevent anyway if no non-res.
good luck to you
"I'm your brother, just make it count."