I am not sure about the incubator question but I heavily advise against bloody goose asking hatchery goslings, of something goes wrong she can and will kill them, I'm happy to be able to help with the genetics :)
The colored sebastolpols are not pure bred because color isn't naturally found in sebastolpols, color is often bred in using other breeds then offspring are bred back to sebastolpols because color is dominant over white in geese
I haven't personally before but I have looked into genetics and...