oriental sweetgum

I couldn't find a whole lot online and what I could find was about our American Sweetgum and people having little success with air layers. I have a decent amount of this trunk I'm planning to chop and thought I could possibly air layer it off. Anybody else have success with this or thoughts?

This is tree #2 from Brent at Evergreen Gardenworks. Really nice size for the price, decent size trunk and decent movement. I am considering cutting down drastically to maybe the red line. Any thoughts? Not sure if that would be too drastic or what. Also wasn't sure the best time to make such a...