Some corrections (that I unfortunately cannot edit into my original post!) NSRunningApplication.activateWithOptions isn't deprecated, but the option NSApplicationActivateIgnoringOtherApps is. Instead of NSRunningApplication.yieldActivationToApplication I meant NSApplication.yieldActivationToApplication. Instead of NSRunningApplication.activate I meant NSRunningApplication.activateFromApplication. These corrections aside, I'm still looking for an answer to my original main question.

Please disregard. The installation scripts were deactivating an existing kernel extension before activating, hence the extra prompt.