I've decided to let the broody Buff Orpington hen try her hand at actually hatching some eggs. Thanks to those of you who left comments; although all three of you live in more temperate climates than MI, your sentiments reinforced my own inclination.
I gave her a dozen, as I'm uncertain how many of these are fertile. We have multiple roosters, and they're not shy about doing their thing, but they have a lot of hens to cover. Anyway, I went through the 14 eggs that had been sitting at room temperature overnight, and removed the two that were cracked.
Check back in 21 days to see what actually comes of this experiment. Given that she's made the nest in a 40 gallon tub, it should be easy for her to keep the hatchlings together and keep them warm --- and for me to provide supplemental water/feed for them.
What fun is a farm if you never try crazy things?