Unfortunately I don't think you can reverse pack-n-go. Hopefully I am wrong and someone knows a way.
Do you need to replace all those files when you get back to the office? If you are only actually modifying say a dozen of them you should be able to replace just those. When you open your main assembly it should look for the others and find the originals. I would think anyway.
That's too bad they wont get you guys on EPDM. It certainly has its quirks, but I think it has helped us a lot to reduce lag at work. It sounds like its exactly what you need to take work home too. If it's cost keeping your IT guys from it may want to document how many hours you have to spend manually replacing all those files.