I presume that looks are all that matter in this case.
There are a couple of very high lead bronzes that might work.
There are also some brasses with less than 60% Cu and small amounts of Mn that have low melting points. C86400 and C86500 are actually rather high strength and commonly used for marine hardware. I have never cast them, but I would expect that you would still need 950C to get good castings. There should be a lot of information on 865 available. Try copper.org
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Rust never sleeps
Neither should your protection