I like the theory and I believe it would happen but it won't be this arc because sanji just got the raid suit and for this to happen he will either have to get overcome the raid suit to the point where he doesn't need to use or someone destroys it.
I think he get new flames (black from "black leg sanji") + combine with raid suit when fighting king because I think king to sanji is how I see kat to luffy where that was his superior and luffy has to overcome him.