I still think it's worth a try to patch it up. If you can patch a plane/helicopter that is under thousands pounds of pressure I don't see why not patch a kayak.
You have nothing to lose. patch it up try it in the harbor if it works then your good to go. If it fails then the shredder it is.
At least if it fails your not falling from 30,000 feet
Which ever way you go good luck!