The bat maker at GN mentioned i could open the crack with a knife and glue it with gorilla wood glue and clamp but could not guarantee how long the repair would last.
That’s exactly what you can do mate. You will be amazed how well they can hold up after repairs. One thing to consider though is how you bat! If you swing from the hip and maybe bat more when it’s smash and go than the chances of it going again are that bit higher. Remove the scuff get lots of Gorilla wood glue in and clamp for 24 hours. Drill probably 3 holes in that through the edge and down and then sand and scuff.
Here is a bat of mine i repairs last summer and used all last season. Not as bad I don’t think as your GN but the spit went a third of the way up the back, all through the toe and about 4inch into the face of the bat. This was just glued and clamped.
It’s still a gun bat now and been netting with it last few weeks.
Worst case it breaks but all you will have lost is a few hours of your time but it’s lots of fun in my opinion working with bats.