whats the nebari like? trees are built from the bottom up. even if you chopped low, at this point the nebari appears to be non existent. its decent starter material. good to practice on. if your instincts feels its too tall i would agree. the proportions dont look right. so you could begin by uncovering the nebari, and chopping to the first branch to see what pops lower over summer.
some folks like to ground layer trees to get better roots, ive never done that, i always start with a good nebari. this type of tree would be ok in a forest of similar looking trees if kept tall. hedging material like this is easy to come by and you could add a few more and build a forest or practice on this single tree.