Thank you @Tosin for clarifying the matter.
The letter says that they need to verify your identity in order to give you a work permit. But it also says that other proofs identity are sufficient. So if you can submit other documents, it should work as well.
Anyway, since you are already in contact with a lawyer, I would rely on his advice. He probably knows best what to do, especially since he was able to take a close **** at your case.