I respectfully disagree that plain / brogues belts can only be paired with a likewise plain or brogued shoes. In fact, I think that's a bit too "matchy." If the belt is a dress belt and approximately the same color as the dress shoe, I think that's fine. I fact, I think having four dress belts in black, dark brown, light brown (tan), and burgundy is all anyone needs.
E.g., I wear my burgundy Manatee with my burgundy Cambridges and #8 Imperial gunboats, but also my Hanover #8 shell PTB's.