I am checking in, sounds like great progress! And the family stories - great if you can record them somehow.
If I recall, I think Haunted55 waited more than five days after putting the iodine on the bumble. She soaked, applied the clear iodine, kept the duck in a quiet clean environment, got busy and did not have a chance to examine the foot carefully for several days. That's when she soaked the foot and discovered the dark plug had formed and could be removed. For the second case, she could not easily pull it, so she reapplied the clear iodine waited another several days then that worked.
When I have treated early bumblefoot with just antibiotic ointment, it has taken 5 or 6 weeks to completely knock it out. It's slow, but to me it's worth it to avoid cutting the foot.