What you would want to do in this case is leverage the WLAN templates (System > Templates > WLAN). Create the WLAN as a template and then apply it to all the zones. If you ever need to make a change to the WLAN, just change the template and reapply. It gives you a centralized config object with consistency across zones. And of course, if you have some subset of zones with different WLAN sets, you can create other templates for that purpose. And you can always override individual zones/WLANs with unique settings (different from template) as needed (or create a 2nd template for that config fork).
Tinker with it a bit and see if it solves your case.