You sure could and i do that as well. I currently have a black sex link sitting on 2 geese eggs a friend gave to a few weeks back. Looks so funny as she is so far off the ground but she is not moving lol. I also have turkeys sitting on heaps of eggs too. My 3 girls like to share the one nest. You can use whatever you have available to hatch.
but doesn't your sex link realize that the geese eggs are to big or at least notice that when they hatch that there almost as big as her. hahahh?