Would a black holes event horizon shrink if you expelled matter from a wormhole located in the event horizon?

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Take a normal run of the mill non rotating black hole, and through the power of a thought experiment construct a wormhole that has a mouth inside the apparent event horizon and an exit that is 1 light year away from the black hole.

Finally, also through the power of a thought experiment, you then proceed to empty all of the mass of the black hole that you can through the wormhole.

My question is this, since the mass that was previously in the apparent even horizon of the black hole is now causally connected to the rest of spacetime, would the apparent event horizon shrink, and if so would it take one light year to shrink? My thinking is that the spacetime information would take a year to propagate from the exit of the wormhole to the exterior of the black hole, and only at that moment the black hole apparent horizon will start shrinking.