If you made a new save or backed up your existing save before trying the inventory file swap, it would be easy to revert to the pre-attempt version, and re-do the file swap a little more carefully.
You get sealed in the catacombs shortly after you enter; it was designed to lead straight to the end of the act. If you dropped one teleporter stone and hex teleport out of the catacombs, you may be able to finish off other quests before returning by teleporter stone and picking up the last crystal fragment.
Teleporting anywhere (via hex editor) 
