I am not 100% sure whether i understand your issue. You plan to come here in a couple of years and have usd?
A few lose points:
1) the Forecast for next year’s inflation is according to the government 29% (in my view this is a 1% scenario, i expect it to be far higher)
2) beyond 2021, it is even much more speculative. I am more on the pessimistic side, but there are also other members here who are more optimistic. I really do expect an exonomic and social meltdown. Then all forecasts and budgets are obsolete
3) whether there is still an official and a blue rate in a few years (or months): who knows.
4) i think what you are really interested in is not the inflation rate, but the development of your purchase power. Normally, the devaluation is about the same as the inflation rate. Over the last year or so, the devaluation however was far bigger than the local inflation. So if the inflation is 200%, but the peso loses 250% against the usd, you even gain in terms of purchase power (you take a taxi through the city for 2 usd or go for lunch for 4 usd.) So the inflation per se is not interesting, but the difference between inflation and devaluation.
But again, totally impossible to make any predictions here.