So to repair the plastidip that was torn up by the tumbleweed, I just removed the damaged bits from the lower chrome lip surrounding the upper grille, which was easy. It just pulls up, it's sort of elasticky. Then I masked out around that lower lip section with painters tape, and covered the rest of the area with newspaper.
Then it was just a matter of respraying 4 coats, letting it dry a bit, then removing all the tape and newspaper, plus the overspray strip. I also redid the side vent because it had torn in a couple spots.