It's like two hours of work with dnsmasq and a minimal Linux ISO. The only problem is that much of the work is not shareable between organisations; network structures differ, architectures may differ, partition layout may differ, the list of assets (and their MAC addresses) will differ.
Edit: + individual organisations won't be storing their BitLocker recovery keys in the same manner as each other either. You did back up the recovery keys when you enabled BitLocker, right? Modern cryptsetup(8) supports a BITLK extension for unlocking said volumes with a recovery key. Again, this can be scripted.
Because writing such a script (that mounts the filesystem and delete a file) under stress and time constraint is a great idea? That's a recipe for a worse disaster. The best solution, for now, is to go PC by PC manually. The sole reason the situation is as is was the lack of backstage testing.