As Regulation DD does not apply to non consumer accounts, your disclosures must be of your own design and it's hard to imagine what they might say. (It is highly doubtful that you have the right to "call" or terminate the contract unilaterally.) If the regulation did apply, you would notify the customer of the change in terms, elimination of the the automatically renewable feature, in the maturity notice which is generally sent 10 days prior to maturity. Barring contractual language to the contrary, that should work.
Figure out now how many customers (time deposits) this actually applies to. Put every other aspect of your beneficial ownership program in place first and worry about this when everything else is done. It's possible that FinCEN may interpret the issue out of existence. Either way, it's not that big of a deal.
_________________________
In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.