I read the source code of Unreal carefully. Landscape is managed by LandscapeSubsystem. I think I should be able to get LandscapeSubsystem at runtime and modify the values of some variables in it to affect its tick behavior.
Unreal’s Subsystem is mapped by class, and they are all managed by SubsystemCollection. SubsystemCollection will find all subclasses of WorldSubsystem during initialization and initialize these subclasses (subsystems), so you can’t even create a class inherited from LandscapeSubsystem through C++ and replace the old Landscape Subsystem.
I think this may be the only place we can do it without modifying the engine source code.
I wonder why the engine developers don’t add a key name and priority to WorldSubsystem, and then the subsystem is searched and mapped by this key name, so that we have more freedom.