I don't know where you get your snappers but my covers are not "glued to the disc hub" at all. The plastic bit is quite easy to replace (although I have no idea where you'd purchase replacements). I've done it with a few that got damaged in shipment - purchased a real cheap snapper and swapped the plastic disc hub/holder.I've always disliked the snappers because adjacent cases tend to hang up on the snapper part of the case when I'm returning them to the shelf, and because the cover is glued to the disc hub. However, I still have a couple dozen WB snapper cases left, most of which I'd like to retire for new Blu-rays.
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The top and bottom pieces simply snap off. The top image is with the plastic insert completely removed and the bottom is a close up of the top hold-down snapped up/open.
It's "digibooks" which are truly horrible with the disc trays glued to the book and can't be replaced or repaired if damaged.