I'll say again that the scope of the area you're recoring is too big to do from the inside. I sincerely wish you good luck if you go that route, but I don't see a repair stretching from the companionway to the foredeck ending well.
Much of the repaired area will be under non-skid, right? Non-skid is very easy to paint with durable products like Interlux Interdeck.
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