In my opinion, I dislike the idea of clipping wings. They were born to fly and for us to just take that away from them- I feel guilty and terrible. Even if the wings grow back, I still feel responsible and seem like i had created a sin.
There's a stickie on here, after reading it, you can then decide https://talkbudgies.com/general-budgi...-not-clip.html
You could place branches around the room for landing spots and have a playground near the cage. I'm sure you're already aware of the covering mirrors, turning off fans etc.
If your walls are white or just plain, you could stick on some photos or stickers so they know something is there.
Budgies will learn quickly about how big the area is and their environment/surroundings. As long as there aren't any major injuries, they will get used to it and stop flying into the walls.
Are your budgies out all the time? Or just for a few hours everyday/every other day?
Maybe in the time that they are in the cage, you could start taming/work more on taming your budgies?