One step that can be done by the Bank is to allow Bitcoin transactions on condition that they have to be registered on a special platform. Later the patform must be accompanied by a central bank permit.
This means that all bitcoin transactions must be recorded by regulators, now there are many illegal bitcoin transactions without permission and without supervision from regulators.
There is one country that can use it, for example in Japan that allows transactions with Bitcoin, even for payments in retail stores.
The government in Japan actually allows retail stores to accept payments via bitcoin. There are 4,000 stores that accept bitcoin payments. So far there are no problems. Even the Japanese government is making its own cryptocurrency.
Banking with bitcoin is something different from just buying and selling goods in retail stores like in Japan. There are many rules that need to be followed when sending money via bank (e.g. you need to indicate purpose of payment).
So I don't think such platforms will ever be widespread as hardly any users of bitcoin would like their transactions to be monitored and tracked.