Ah yes i should read more, I like the idea of hiding the pipes in it. But still i think it would be really loud even with a stand pipe of somesort.
I think it would be less loud actually, as the same amount of water is spread out over a greater area. With the dursos in the overflow the water will only fall a couple of inches. With less flow per inch it will probably just run down the other side of the glass and make no noise at all.