I have been using Sodium sulfide for toning my Albumen prints and as far as I am concerned they look just fine. You can use the part B of Kodaks sepea toner or just buy the Sodium sulfide in bulk,it's cheap and a little goes a long way, But it shuld be used at half or third strength or it will yellow the highlites too badly. Be shure the fixer is washed out well or that will cause yellowing of the highlights too. About 10 seconds or so will make a change.
Experiment and see what you get.