One thing worth commending is your desire to experiment with ideas.

But the substanse of your proposal doesn't bring any innovation that cannot be achieved by simpler means.
The Bitcoin Bank must be a reputable organization so that both merchants and users can deposit btc in their accounts and not fear losing it.
We already have the likes of Coinbase.

Bitpay can reverse payments if merchant was fraudulent. And if Bitpay also adopts some kind of GreenAddress-like functionality, they can offer true instant transactions.

This checks off everything on your "Features and benefits" list.

Except for maybe security where you propose to store btc in a bank because a bank is less likely to be hacked that one's computer. But who in this age of hardware wallets stores significant amounts of btc on their laptops?

Good luck with your further research.