The person opening the account and providing the beneficial ownership information may not be a signer on the account and, thus, would not sign the signature card.
Assuming the person opening the account is also a signatory, the Preamble does not say a bank cannot make the certifying signature serve anciallary purposes, but it does not say you can either. In assuming the certification does not require a dedicated signature, your bank is subjecting itself to the judgment of any third party reviewer with a contrary opinion...
Mine is that it doesn't make any difference whether the information and the certification are on the same piece of paper, but if an examiner asks you for the "certification" it needs to be a dedicated signature (wet or dry) tied specifically to this new account and Appendix A's certification language. Remember, the proponents believe this certification would be useful in a prosecution; it's doubtful they would want it watered down more than it already is. (Their premise is hogwash, but examiners I've spoken with already believe it's true.)
_________________________
In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.