No, I won't do a surgery again, unless the soaking, salve, wrapping, triple antibiotic ointment, doughnut bandages doesn't work. Then I would go to a veterinarian.
I've read through the entire thread, so I'm feeling hopeful that the combinations of treatments described will work.
There's no splintery surfaces on the ladders. We had filed any possible rough edges on the wood.
This bird developed multiple places of bumblefoot about as soon as she was full grown. She is healthy otherwise, but she must have a genetic susceptibility.
She also eats more than anyone else, stuffing her crop until no more can fit in there. My other birds I hold don't fill their crops so much. As with people, I think if she did some fasting to cleanse her system that would help her body to heal, but that's difficult to explain to a bird.