I can't quite see how you can escape from repainting it. The only way to 'tone it down' is to put a layer of something over it, so you may as well bite the bullet and repaint in a more neutral colour. If you really don't feel like doing that the only thing I can think of is a semi-transparent finish, like a glaze, probably with a bit of white/burnt sienna etc etc in it. You would need to mix up oil-paints as desired ( artists oil-paints usually, but I suppose anything suitable will do, with a bit of white spirit and the glaze. I'm not sure whether you can get satin glazes. Maybe a quick and dirty alternative is a pot of clear satin varnish mixed with some appropriate paints you have to hand, probably some white/magnolia/beige etc and test it over a sample of your 'Elizabethan Gold' and see how it looks.
Andy.