I'd avoid a clear coat. All of them have some negatives. Some yellow with age, some ARE yellow, all will come off from wear, most don't look like the natural metal.

I'd give some waxes a try. They will have to be re-applied regularly, but I think the effect will be better. You might also experiment with some Future floor finish, now produced as Pledge with Future...something or another. It forms a clear and hard coat that is nearly undetectable.