It is not obvious why a product of this nature should be operated by a central bank rather than private banks, but it would probably stimulate innovation in this area. One might argue that, legally, a retail CBDC is a parallel to cash because the central bank is the direct counterparty, but in practice customers are unlikely to perceive it as a cash substitute.
Transferring resources permanently from core to peripheral countries would be tantamount to accepting that economies will not adjust and that countries will not find their way back in the global economy.