As far as I remember from the last cepo, Bitcoin always had a value around the Blue rate. There are now a number of exchanges you can use to transfer money via Bitcoin and cash out in Argentina at a very good rate (which will certainly save a trip to Uruguay to get dollars, which I used to do).
Currently I'm just using Western Union as that has a great rate right now. But I'm considering using Bitcoin in the future.
There is a site called Ripio, which is an exchange in Argentina. That's the one I've signed up with, but there are others.
You can buy $100, $200 USD or whatever of Bitcoin using an exchange outside the country using your foreign account, like Coinbase. Then send it to your Ripio wallet and cash out directly to your Argentine bank account or MercadoPago at the Blue rate.
It involves setting up an account on Ripio and another exchange outside the country, so it's not hassle-free. But once it's set up, it seems like a fast way to change money at somewhere around the Blue rate (for those who don't have physical dollars in the country).
And if you don't want to risk the volatility of Bitcoin, you could buy a stablecoin like DAI (which you can also sell on Ripio) which is always about $1 dollar.