No, it's really not possible - since Unity is not storing it's password in the directory where CM could get at it I'm not real sure how you'd do this, TAC supported or not. The phone password is stored as an MD5 hash string in the local SQL table on the Unity server the subscriber was created on. We only look there when authenticating users over the phone.
Unless Unity and/or CM made code changes to share the PW (either replicate it around in known spot or know which SQL db to connect to remotely to go fetch it directly - not a very good idea) this simply wont work. Honest. We're not holding out on you to be obstinate, this just isn't possible without development changes.
