If I was him, I'd get a diverse group of really serious experts (mostly but not entirely libertarian-leaning), and see if they can come up with some sane policy changes which won't cause riots.
That's a very good idea. He has 2 ways of approaching this. Either he remains 100% true to his words and starts doing as promised, in which case they're going to label him a nutjob and attack on all fronts, or thread lightly and try to slowly push as many ideas as possible, starting from the most acceptable ones.
He has to cut expenses and save money, but not at the expense of jobs. Argentina is rich in natural resources, so there's a way to make money and people will judge him on what he managed to improve.
I'd love to see him make bitcoin profits non-taxable and encourage mining. Make Argentina a safe haven for cryptocurrencies.