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Nothing would beat light as far as transmission goes. Also, the further the shutter the further that doesn't matter. As the galaxy expands you might block light for something that'll have moved away and miss the signal, so it's a pretty big risk to try and position this shutter strategically enough to make that work.
However, a fun thing to think about is, after you make your signal thing to broadcast, by the time that message reaches other galaxies, 33k years is long enough that other life might very well have come into existence and evolved.
Even crazier to think someone out there may have already broadcast their own message and we don't have the means or technology to receive it or notice because they are so many others out there, OR it just hasn't reached us yet. Maybe in another could thousand years.