Downwind - Check out Upland Journal.com for the same topic - there's a few guys there that have CZ products & 28 ga. guns, not sure about the combo.
One of my buddies also has a CZ in 20ga O/U config - it's sweet - nice balance, good fit & finish and in 12ga can handle modern loads, I call it a win.
Be sure to confirm ejectors or extractors if you have a preference