If your Country bans Bitcoin, transfer your Bitcoin to a wallet of a foreign country (Coinbase operates in 32 countries). If you want to cash in, then use third party services like Virwox to get USD in Paypal, then use Paypal to get cash in your local currency.
Bitcoin is like Torrent, peer to peer and you cant block it. If you have access to internet, You can use Bitcoin anytime, anywhere!
This is simply too complicated, besides if you send your money to an exchange then if you want to withdraw you will have to reveal your identity and it is possible the exchange will refuse based on your nationality, you only have three options if bitcoin is banned in your country, you get rid of it or you keep it defying the law or you move out of your country.