How big are the trees? You could do some pruning to reduce tree height. You could also plant trees on dwarfing rootstocks as another option. It’s possible to keep trees small on standard size rootstocks like mazzard if you chose the right training system KGB, UFO, TSA, etc. and plan from the beginning to keep the trees at a lower height.
For SWD you will have to spray and smaller trees will help with this. Another option is to bag the entire tree to keep the SWD out. This won’t work in the East due to increased problems with rot due to rain and high humidity but in Orange County I think you would be fine. Here is thread that discusses bagging entire trees.