I have to thank you for this post. I have darn near the same set up with my porch and was trying to come up with a way of doing the same thing with coro.
My thought was just use the dumb RGB and go with two channels per column instead of pixels. That would give the alternating color option / any one color option. That and use the rectangle modules instead of the square.
Was there a reason you went with square over rectangle? Does it fill better with a square?
Are you doing any tricks for storage? Like the column pieces in half if you don't have the storage room to make them more manageable.