In a word: yes! I'm assuming the underlying black is a high temp like Rustoleum BBQ black. you will have some "loss" on he firebox that will need touch-up (I just oil mine w/peanut oil) from time to time but at normal BBQ temps (generally less than 350*) I'm thinking (based on experience with my pit) the discolored/burned paint won't go more than a couple inches from the firebox. I think your neat graphics are safe. Time will tell. Good luck!
Weber 26.75 OTG w/CI grates & SJ/WSM Mini
Home built 24"x72" reverse flow stick burner trailer with 18"x44" grill w/CI grates and upright SS gas oven/smoker.
Home built 48" fire pit with a 30"x30" Santa Maria style ranch grill.
Home built lump charcoal retort, iGrill & a bunch of other cooking toys.