Right now I’m working pretty late at the day job, fighting for weekends, so I wouldn’t be able to turn a project around within this season. If the base is not distorted very far across the board, much of the board’s strength may be intact. I am guessing ski shops are saying no because the damage extends past just the sidewall into the core, maybe an inch or so.
I took the ptex off of an ultracraft once, added a bunch of carbon back in, epoxied new ptex on and had it ground. It looked great, but exploded again after a handful of tours. This board had a cracked core though, most of your core may well be intact, but it does have a weak point now.
I’d get some epoxy, warm it so it flows well and try to get as much in the cracks as you can (twist the cracks open a little with a small screwdriver) to seal it up from water and ride it till it says no more.
There are ski shops that will do that kind of surgery; at least to replace the edge, fill the base side and cover with a new ptex patch, probably in the $200 range.
I think that board has poplar on the rails, poplar without a lot of fiberglass on it will compress a bit compared to maple, birch, black locust etc.