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Caseyholy shit man. Ok just a disclaimer I have never physically done what I am going to suggest to you but I think it could work. Your going to have to do a huge section of base repair, all the way back to where the delam ends. Then resecure the edge (there are techniques for this like using tiny screws I'm not an expert though google it) and epoxy new base material back on. Pretty huge amount of surgery but hey, anything is possible.
The other easier option would be to just squirt a bunch of epoxy into the separated area and clamp the fuck out of it and hope it holds, might want to start with that until its time for new skis.