Can ducks raise eggs themselves?
I have had ducks hatch their own eggs, seemed to be ok.
Incubators are not expensive, you can make one for around £18-22.
I use the polystyrene type, actually just bought a new larger one yesterday, holds 30 eggs and cost £38. It is also very stable.
Here is the same as I have: HERE
Hope that helps..
Muscovies are some of the BEST broodies. I see no reason why you would need a incubator with them around.