Twin Keel vs Bulb Keel
Twin keel: They are very common amoung the English and Dutch who have a major tide change. When the tide went out the twin keel would sit in the mud wihout careening. And when the tide came back in they lift up out of the mud and back to normal.
And mounting a 1600 lb keel is really nothing. On my 40 footer, my keel is 6500 lb, and I just use a 10 ton forktruck to lift it up to the hull. If your going to build a vessel your going to need to hire in some equipment anyway to move it around, flip it over or step the mast.