I keep waterfowl of various kinds, cranes, partridge, quail, pheasants, shorebirds, and lots besides - all eggs go in the same incubator, all need the same incubation conditions, all hatch fine. The bottom of the cabinet incubator is used for hatching - for everything except waterfowl, normal incubation RH works fine, for waterfowl eggs I use something like a Tupperware box with half an inch of water in the base and the eggs on a wire mesh shelf covered in paper towel, half inch above the water. To give some air exchange, there are a few quarter inch holes on the top of the box. The water is also added at incubation temperature.
Been doing things this way for over 30 years.
Various comments about waterfowl eggs not being incubated with poultry are common, but so long as you keep everything clean, the stories are just that - stories.