On paper sure there's merit to it, in practice it's probably an exercise in futility while the exploit is un-patched and GreyKey is useful to law enforcement.
I would think the best use of Apple's time is reverse engineering (if the exploit is not already assumed/known) the device and releasing an update rendering it useless. If that isn't possible, perhaps litigation would be the next step. However simply making it 'not work' for LE would be the lowest hanging fruit (under many assumptions about the complexity of this exploit).