I have 3T Ergonovas (CF) on my CX bike and like them a lot. Very comfortable and the shallow drop and short reach is ideal for a CX bike. IMO the chance of damaging them while CX racing is pretty low. Most races you spend the vast majority of time on grass, hard pack dirt or mud with only short sections on asphalt. Speeds are typically relatively low compared to a road biking and going down on grass or dirt at 15mph is unlikely to cause any damage to a CF handlebar. BTW IMO crashes in CX are not that common.

3T makes a bar specific to CX applications which is a available in wider sizes then their road bars.