*hugs* I second talking to your boss and seeing if there’s a solution to that issue, if you haven’t already. That sounds hellish, so I hope they can help you sort things out.
I’m not sure if claw caps would be a good solution for your cat? It might be worth getting in contact with a cat behaviourist, too, either online or through a magazine (some cat magazines in the UK offer advice to readers who contact them - I’m not sure where you are, though). Have you tried anything like pheromone plug-ins? They can help calm cats down.