Came across Drone Tweaks yesterday who seem to do a FCC mode for both Android and IOS for €24
Maybe an option if you do not want to hack your bird and just ant FCC mode. You can also use more than one drone as long as they use the same app on your phone - say DJI Fly
If you have the Air 2 and have the correct model - model number must end in 3W and not 1N - they have a app to unlock airsense as well.
They modify the app and so you will fly with their app rather than DJIs hence why there is no limit to the drones.