ouch... difficult! My suggestion would be to find someone who specializes in parts for late 1800s French clocks, I've seen a few with very similar hands in both size and style but finished in brass or in gold (using a nasty & friggin dangerous plating process called fire gilding that involves dissolving gold in a mercury solution, painting that on and then burning off the mercury). Fire gilt gold gives a softer finish in a colour not unlike that shown in the first photo above. They won't be easy to find but will still likely be far more common than copper.
or find some common American hands in blue steel and get them cleaned and plated in copper.
Click to expand...