. Uggh! My beautiful boat
: is blemished forever!

Yeah well so am I, and I don't look a day over ..oh never mind.
How'd it happen? This is valuable data here, I don't hear people taking kayaks to three point bending machines at universitys so any real life experience is gold. If it didn't involve waves, rocks and beautiful women that's ok,,it's the physics that matter, right?
How about cleaning, grinding out the hole, injecting epoxy into the split layers (warm epoxy into warm wood?), putting in tight fitting wood blank and so on, glass, etc. If that wood chunk partially fills the space how about doing the same injecting routine, laying a plastic covered piece of wood on the outside,and inside with pressure on both sides cramming the epoxy around/into the area, sand and glass away. It might not look too bad when it's all done.
You could alway paint a stylized art nouveau/whale/bandaid drawing over it?