I think this is not the right way to operate policy. To see why, remember that it is the level of interest rates which matters. To be sure, changes in interest rates make the news, and may well have some announcement effect in themselves - mainly if they shift expectations about the level of interest rates in the future.
As a result, the financial institutions can now ably trade the Deposit Auction facility in the secondary market. Stakeholder impact is critical for the long-term survival of Supervised Financial Institutions (SFIs).