Now how did you get that hole?
Don't worry, it's not structural
Could have used chewing gum to seal it for a quick spin
(Actually, when I refinished my hull I found a spot in the hull, well below the water line, that had been 'fixed' with something having the consistency of fresh chewing gum (probably some caulking compound). The PO had merely painted it over, and it held for a decade (at least).
Actually, this is where polyester-based repair options shine, even though I usually prefer epoxy. That gap looks narrow enough that a big dab of "high strength marine filler" from 3M should fill it. That stuff is tough enough for the purpose (I think it has some chopped fibers in it). And it cures fast enough for you to be in the water the same day!!
I've used this filler to build up edges of foils and it's held up nicely for that purpose, I also used it to restore gouges in the keel.
Because of the geometry, doing a laminate layup is difficult without any support and, also because of the same geometry, you don't really need to do more than provide a "plug" that keeps the water out and presents a fair outer shape - there's enough redundant structural support there that you don't need the repair to give strength / stiffness to the boat.
Once you have your "plug" you can grind it level, and add a layer of laminate on top as an extra insurance (against bumping the same spot again and pushing your "plug" into the boat. Some form of backing, like a piece of plastic on a fishing line that you can use to pull (from the outside) to push the backing against the repair from the inside would help.