Lead is often present in alloys that are intended for machining; it makes them behave much better under the tool bit edge. I’d say if it is not intended for prolonged contact with consumables (especially acidic ones) it’s rather harmless.
It is easy-ish to repolish, and the tarnish may even be considered looking vintage/antique. Or you can add a little germanium to the alloy, that will prevent tarnishing.
Aluminium bronze may also work well. It is used on ships as it inhibits growth of marine organisms, so it may have the oligodynamic effect as well.
