Foundry Cycles, which I believe is another QBP brand, has a couple of (relatively) budget oriented carbon frames that may fit the bill. The Thresher is their "road endurance" model, sporting disc brakes and clearance for 28c (per Tree Fort Bikes website). The Augur is a "cross utility" bike that has geometry that's not so different from a road endurance bike (73/73 head and seat tube angles, 42.5cm chainstays) and fairly generous clearances.
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