Many boats with a wheel have an emergency tiller - all should. On some it is hard to access, like a Coronado 35 for example - it is beneath the bed in the master stateroom.
But in many aft cockpit boats it is often either at the level of the cockpit sole or on the aft deck. If that is the case the emergency tiller becomes the main method of steering. Often a new tiller is made out of wood if the emergency tiller is metal and it is bolted permanently instead of just a slip on affair.
Much more expensive to go the other way.