The answer is Yes! My Silkie - Maman is brilliant with duck eggs - she sat on an Indian Runner egg for ages - when it started to pip I gave it to one of my Muscovy girls Julia - Julia promptly picked the egg up - threw it against a wall, the chick started to come out of it's shell, Julia then ate through the remaining shell and with her beak she pushed the duckling underneath her - I thought it would be dead for sure but it survived ( with a headache probably ) - the runner chick stayed with Julia for about 2 months and then decided it wanted to venture further so it ended up spending most of it's time with it;s natural parents.... I say go for it!
Best of luck
Suzie