It looks like you are trying to reduce a Fleet combat simulator to a ship combat simulator. While I don't have any specific objections to the change you are suggesting, I will comment that it will dramatically slow down play of the game in fleet actions.
I also would point out that maybe you need to look a bit at the rules in the 1st Edition of High Guard as they are cover some of the points you specifically mention.
I should point out at this point that my pet project is how to handle ship built under High Guard with in the Book 2 ship combat rules. Note my focus is on adventure scale ships. I have considered the 1000 dTon baseline ships as well and it becomes clear a different scaling factor would be needed to comfortably handle them.
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Evyn
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