I would say go for it BUT wait until the babies are a little older and hardier. My flock of Toulouse took right away to four month old goslings I "gave" them. Even the ganders were tender and protective (the one that chased and chomped on ME, especially tender).
First time mamas aren't experienced, and hatchlings are delicate, so I'd grow them for a couple of weeks before you give them to her. My flock had no broodies at the time they adopted, so I don't think they are like chickens, they don't reject or harm the young.
Once you are ready to give them to her, let your adults "see" them through chicken wire, just to guage how they'll behave. The first time I put my babies out behind a piece of chicken wire, the adults would not LEAVE them, lol.
Once in a while, a gander is not a good parent, but you should know that right away. My flock was mostly ganders, but all were kind and watchful
In fact, I couldn't get close to those babies again LOL once I handed them over.
Go cautiously (to protect the babies) but chances are very good you'll have success and a very happy mama goose.