Because of the dynamics and churning water of a tsunami, I'm not sure if even a short keel would help this design. This design may be intended to bob like a cork and will probably sit high in the water above all the turmoil below. Might work, might not, no way to really test it. A scale model for testing in a shallow tank might be beneficial.
You may have inadvertently stumbled onto something. A design like a buoy may be fundamentally a better approach for a watercraft during a tsunami. I just did a quick Internet search for buoys. There is not much to reinvent.
I don't see much use for the boat design in the original post. It's not like you'll be able to cruise around the city. There will be too many obstacles. Stuff will break the motor rather quickly, especially if the hull runs deep.
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