My first Pilgrim egg is developing. I think goose eggs have some tolerance for cold temps. I have 3 incubators suitable for goose eggs. 2 only hold 10 eggs each, they are both full of goose and muscovy eggs. The 3rd is my Brinsea cabinet. It is full now, but mostly chicken eggs that can move into the cheaper incubators as needed, so I can add your eggs and see how they do. Goose eggs are a dream to candle, I can easily see development at 6 days, probably sooner, so they don't take up space for long if they are not fertile.
I also have sources for Embden, Sebastopol and American Buff eggs. If those flocks ever figure out fertility, I could have 5 breeds of goslings hatching weekly!