If you don’t have deer problems and your main goal is a shorter tree that’s easy to spray and easy to harvest you’re going to have to make some drastic cuts. The reason why you cant really wait to cut the larger branches later is because branches work like pipes, so the larger diameter branches will always draw the most resources and grow the most, stunting the growth of the smaller branches.
The lowest effort way is to right now cut at somewhere between knee and waist high, pick 3-4 evenly spaced branches and remove everything else, it also pays to use spreaders or tie-downs to get the branches to a ~45° angle. You want to start your lowest branch at least 1’ from the ground.
If you really cant for some reason do the drastic cuts above an option would be to do a partial girdle / spiral girdle to artificially stunt the growth of the existing larger branches. You basically take a hacksaw blade and cut into the branch 1/8" deep in a spiral to limit the resource uptake. See this example: Partial girdling a pluot tree
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