I've found goose eggs to be really difficult to hatch in an incubator (any hints welcome, as I keep messing up with one thing or another).
Likewise though, most geese don't have a great reputation as mothers, so that may not be the no-brainer that it initially seems, even if one of yours does go broody.
Do you have a broody hen you could use as a stopgap? You'd need to turn the eggs for her, but I know people who have done this successfully in the past.