I had a grey missing both feet. There were daily inspections of the stumps watching for pressure areas. Flat perches were great (don't have to be real big and birds would hang their butt over the end to poop. Grape vine perches are great. The surface is easy to balance on. Mine liked one of the vine arms going up slightly as she would lean against that to rest. Her beak was fine and she could climb anywhere. I had cages with wide enough spacing for her to stick her leg through as she would grasp the bar with stump and leg then use her beak to move all over the cage. I also used wire platforms for keets and would make mini pillow cases of fleece. I could slide them on and off. There was no holding her back. She was born that way. A couple of her siblings had even worse wing/extremity deformities but were still adopted. At first she scooted across the floor then learned how to manage in a cage. She could climb and go where ever she wanted to. I put a dog crate pad on the floor of the cage covered with newspaper and I put another pad outside the cage on the floor. If she fell, she fell but was not hurt. She would just get up and continue on with what she was doing. They only as handicapped as we encourage them to be.
Congrats on your wonderful new little bird. You two will have a great time together. They are such nice little birds and love them dearly. Look forward to hearing how the two of you make out in the world.