A powerboat designed to overcome hull speed needs to plane to reduce hull friction. The breadth and the relatively flat bottom of said hull requires the deck and superstructure to conform to it's design. That would make such a boat float as easily upside down as right side up. If you were to add a keel and ballast there would be too much surface area and weight to the boat to be able to get it up on plane with any reasonable amount of power and only make it more difficult to capsize. It could still be capsized and would not come back over, just sink faster with the added weight.
I love being on an Even Keel WTF are YOU lookin at?????