That boat is stuck in my neck of the woods... and I have to say....
There is no way in hell anyone is going to get that boat out of that mud on that tidal river without a combination of massive trash pumps and floats. All of this seat-of-the-pants stuff is a complete and total waste of time and energy. Come in at low tide, wade through the mud, secure the floats, evadcuate the cabin, and somehow keep the water from pouring over the cockpit combings on the rising tide. Even then it may just sit there, stuck in the mud, as they say. I hate be a downer about it, but that's the reality.
Maybe the best thing to do at this point is to go in at low tide with an aceytlene torch, cut the mast and standing rigging so that they're no longer a navigational hazzard, and leave her be.