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I don't think it will help you in this case. I think you best bet is to find someone who can edit memory of your CAS with special tools and enable those keys. Or try to fix that enabled key. What happened to it?

P.S. The trick is to put a wire connecting terminals 15 & 30 on OBD socket. But it is designed to help in the case CAS flash failed and you need to try to reflash it. OBD socket is not designed to handle the currents which flow over terminal 15 when car is working normally. But in your case key is not recognized so maybe its safe to try.