I have raised over 60 breeds of chickens and have often brooded bantams and standards together. The only bantam breeds I would not mix with Standards are week old Seramas or Modern Games, they are just too tiny when that young to brood successfully with heavier breeds.
Though some publications recommend brooding other poultry with chicks (notably the recently published "Chick Days"), I would not mix waterfowl in with galliformes (chickens, keets, pheasants, etc.) they grow too rapidly and make pancakes of chicks in no time. Medicated chick feed is toxic to waterfowl and they also just make such a wretched mess of their food and water.