Rows are extremely different from power cleans - consider the arms! - and at least as many people do shitty rows as do shitty cleans. They aren't an easy lift to get right and make useful.
Light deadlifts are the most common and most useful sub, especially if the reason someone is not doing cleans is that they're a physical mess. You can use a clean grip to vary the stress and make it more like the clean with respect to the start. Snatches are another sub to consider that may be more in line with what you can tolerate with your extremities. Try starting with one of these.