Here is a pic of a 4+" scaffold removal on a peach. The tree is 14 years old. I probably removed the scaffold 9 years ago, and it still hasn’t completely healed.
I cut it flush to the trunk (probably leaving the collar). And I painted the naked wound a couple times with copper to preserve the wood so it would have time to callus.
As it turns out, the tree is getting close to the end of it’s productive life, so it was probably a waste of time to paint copper anyway.
Here, peach trees need not be managed for longevity. They are easy to propagate, quick to come into production, and have a short productive life anyway. One could think of them as really really long lived annuals.