My geese like their routine -- I think if you put their house by the chickens and spent a couple weeks herding them into it at night that they would learn that is where they are supposed to be at night.
When I shoo the geese out to our seasonal pond, they love playing in it, but they always end up around their fence, waiting to be let in, or they come all the way to the house and hang out by the back door waiting for snacks . . .. so I think they'd figure out the routine. On the other hand, I can wade through the seasonal pond to round them up, and it sounds like yours is bigger than that. If you have them used to being fed, I'd bet they'd come for bread though -- mine will do anything for a nice snack of bread or watermelon.
I'd lean heavily on the side of safety for them, and deal with the pond issue when you can see how they handle the daily routine. I have to say, geese are MUCH easier to herd around than chickens -- no comparison. They stick together, move slowly, and actually can be steered with hand motions . . . nothing like the crazy chickens!
And I heard several things about handling goslings. Have only had mine for about a year, and am only really going on the one gander I have - who could just have a insecure personality . . . he is lowest on the totem pole, which tends to make me insecure! So, maybe handling as goslings isn't the problem that I thought it was. I'm really, really going to be tempted to try it out again if my geese hatch out any goslings . . . They are pretty smart so if you don't give in to them as adults they will be bound to behave better . . . it is when people start running away that they get all full of themselves.