Two scenarios:
1. Ceiling below circling minima. Perform ILS with intention to circle at those minima, and go-around.
OR
2. Ceiling below circling minima. Perform ILS for 03, however tailwind then makes landing impossible on 03. At this stage, you are in daylight VMC conditions below circling minima and you make a visual circuit to land 21.
Both legit?
As I said, by the time we got there, the BKN025 was nowhere to be seen so it wasn't an issue.