That wouldn't be foie gras at that point: just goose liver
Although, there's been research done on naturally produced foie gras. Geese will gorge on feed in the winter (our winter - I don't know when they would do it out in Aussieville
producing an extremely fatty liver. Technically, anyone who keeps their geese on loose feed produce this fatty liver every winter (called "humane foie gras" when marketed, but not officially meeting the French definition of foie gras).
For anyone who is for or against foie gras, I wholeheartedly recommend the book Foie Gras Wars. I was 125% mortified and opposed to the production of foie gras for years, having seen the horrible videos and all that. I read the book because I have an unhealthy fascination with reading anything about waterfowl. After I finished the book (which, surprisingly, gave away a lot of really good information about how regular meat ducks are raised - something I hadn't found anywhere else), I decided I wanted to try it on 2-3 ducks and 2-3 geese myself before passing full judgement.
Anyhow, as far as the angel wing goes, if it can be fixed then it really should. It will look less grusome and your goose will appreciate the ability to walk between tight spaces without getting their feathers caught up on everything
Edit: Er, whoops. Edited to apologize for missing your edit about already knowing it's just goose liver. Bleh.