Replacing the case is the preferred alternative, but you’ll have to gauge that against the actual used retail value. I’d be leery of collecting an insurance claim without checking on the effect on premiums. If you are considering a repair the first thing I’d consider is removing the strap and see if you can (gently) clamp the gap shut with a small squeeze clamp. If so then research the various super glue adhesives (above my pay grade). Honestly, replacing the case and eating the cost is really the preferred option. You’d have to disclose the repair at sale and I suspect it will always bother you. If you are friendly with a dentist who does ceramic crowns, that could be a potential source for a “super” adhesive. Don’t ask me how I know that…long story…