pension data exchange - used per client, not per licence

I have recently watched the webinar on pension data exchange, and although i new about it already this now made me want to look into this and see if it could work with our clients. I was very disappointed to be told that if you switch to this, it is added to our licence, so would have to use this for all of our (around 90) payroll clients. I do not wish to use this for all clients, and i know it would not work for some clients. I am not sure why you cannot choose weather this is something you use for individual clients?! What if that client doesn't use one of the pension providers allowed? If the payroll has 500+ staff not set up to TAX months it wont work, so i wouldn't use it. I would like the option to pick which clients to use this for, and continue to use the send pension data for the remainder of clients.