You could do this best by a bitcoin ATM I would think, no need to use a bank for that. ATM is also anonymous.
Not when you have an ATM camera pointing in your face and recording you.
Issues is however, you are allowed to bring only back so many cash in or out of a country. Well you can be lucky of course, i have never been checked in detail, but this is a risk. I believer the maximum amount of cash you are allowed to carry into the usa is 10.000 USD.
Do peeps declare their cryptocurrency when they are travelling? All these peeps walking around with over $10k in cryptocurrency on a physical hard wallet or a soft wallet on their computers are leaving/entering the country with currency. Wonder what would happen if they didn't declare it and were found out.