When I got my blue and gold he had major trauma to a foot. (Toe damaged by a larger macaw and never treated so it got infected and very painful until it fell off.) Did your vet do radiographs?
My guy had to do physical therapy using foot toys and different sized perching options. We worked on it twice a day at least for a year. Now he has full function of his foot and can hang from an o ring with one toe, something the vet worried he may never be able to do since the wound was old. There should be a clear treatment plan from an avian vet for how to strengthen foot muscles in this situation, not just adapt the cage (if they can even be worked on, amputating may be on the table.)
Though in the beginning before physical therapy had a chance to work wonders, I put comforters down on the bottom of the cage in case he fell. I also added rope perches and used flat platform perches as spots for his tired feet to rest. The platforms are still his favorite place.
I’m hesitant to give cage design ideas at this point only because if there is a chance that the foot can be strengthened then adaptations that make the foot work less aren’t always the right thing to do. I just don’t know enough about the condition of this little ones particular foot. Sorry I couldn’t be of more help.
