I'm not entirely sure, but I think !BoxHook would require access to internal stuff in lsbox. (It may not be possible to easily identify the modules by name from the outside.)

If you can get the window handle for the box, you can call the existing hook command directly, which is how I trick modules into hooking into skinbox.

And you might try just rehooking the module, it might work for some modules, depending on how they implement it. (of course that requires destroying and recreating boxes :/