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Blake.PFirst off, thank you for realizing and admitting it's your fault, and not bashing k2 for the damage or saying it should be warrantied.
Epoxy is definitely the best bet, however I would look into a 2 part marine epoxy, as it will hold up better to harsh conditions and will be slightly more elastic and less brittle than other types (especially a 5 minute one). (Note I have no experience personally using epoxy for a fix like this, but one of my friends filled a massive delam underfoot with epoxy, and most knowledgable people on here recommend marine grade epoxy for ski fixes)