If you find you have a need to do the repair partially from the interior it may be possible to do so. I have used an epoxy dispenser made from a furring strip with a dental syringe attached. Dental syringes have drawn-out tips and are readily available from places like Jamestown Distributors. The syringe can be attached to the furring stick with stout rubber bands.
The furring stick needs to be just long enough to reach the back stem of the boat but not so long that you can't get your head inside the rear hatch opening to see. In order to depress the syringe plunger put 3 or 4 eye screws into the furring stick along the side the syringe is attached to, and run a length of dowel through the eye screws lined up with the syringe plunger. Fill the syringe with mixed epoxy, mount it on the furring stick and wiggle it in through the rear hatch opening.
It is extremely awkward and you will probably need some a head light or some other light source to see what you are doing. I have found it sometimes possible to epoxy in small pieces of fiberglass cloth by first applying a layer of epoxy and then positioning the cloth over it followed by more epoxy. Repairs done this way won't be pretty, but no one will see it.
Touring Kayak Paddles
Kayak Kaboose Trailer
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