I think the trunk is two thin for its current foliage and I wanted to make the tree look like it's been damaged in a storm just leaving the foliage on the right to fill out and expand over the next few years.
So my questions are; is it too late in spring to air layer the tree?
Will it affect the trees health too much busy taking off that amount of foliage?
I've also had a few branches rust randomly die off, shown in photo 4. Not sure if it's common or if it's due to wiring I've done and damaged the branch during removal..
Image 1 is the tree at present.

Image 2 shows the branches I'm planning on keeping. Just the 3 to the right,

Image 3 shows the area to be air layered

Image 4 is an example of a branch that dying off..

Looking forward to your opinions

Thank you!