When you want to withdraw, come over here and show up, I help you send what you have to address(es) you control on your own wallet, minus a small % or storage cost fee.
Anything online (exchanges, online web wallets, even your own bitcoin-qt wallet connected to the internet) is out of the question.
I get what you mean, but I think you contradicted yourself with that second sentence. Anyone who wanted to use such a service like this wouldn't have their own bitcoin wallet ... they'd just be showing up at your doorstep and wanting either cash or wired to a bank account.