That's a cool story, Rez.
I live in a big Canada goose migration area, and part of my property is federally protected wetland. We always have wild geese in the spring, nesting and raising babies, then leaving until next spring. Once before, a rescue group gave us a human raised juvenile goose in hopes it would leave with next migration, which he did. This year, a wild 2 day old baby showed up in my barn being herded by my geese. His parents were nowhere to be found, so I promptly gave baby to a broody sitting on infertile eggs. That baby is now being raised by his adopted parents. His true parents returned two days later, and they seem to watch over him from afar. The baby may or may not leave when he gets older, and either way I am fine with that.
If you are not equipped for natural raising and release of this baby, I do recommend looking for a local rescue group to take it.
As for raising the baby, he needs heat for the first week, a big stuffed animal to snuggle into, Flockraiser and chopped fresh grass, water in a shallow dish, and a companion baby, if you do not have any geese to give it to. A duckling from your local feed store will do the trick.