If Argentina wants to have a more stable currency, they should simply stop printing more, and start giving higher rates, and it will be a high recession period but if they push through it, no matter how long it takes, they are going to be fine eventually.
They're already doing that (I guess you mean interest rates ... they're growing every month or so), but it's not enough. As I wrote in my discussion with DrBeer, the big problem is the "structural" deficit due to corruption. The state loses, I estimate, at least about 5-10% of its budget due to corrupt overpricing of third-party services and low productivity due to "ñoquis" (state employees doing nothing or almost nothing). The "printing" problem is also linked to the inability of Argentinian treasury to issue bonds for reasonable rates. So they recurr to "MMT" instead.
anti-immigration
That's actually wrong, I wonder where yo've read it. The other two are correct (he has denied climate change in the past, although it's not part of his official proposals, and anti-abortion, he justifies this one with the libertarian "no-agression" principle, but here he's clearly favouring the right of the unborn child over the right of the woman to not be target of "aggression").
Sometimes ideas that look interesting on paper turn out to be devastating in practice.
That's what I think too. Dollarization hasn't solved all problems of Ecuador, El Salvador and Panama. Above all Ecuador, which is the largest of these countries and thus the one most comparable with Argentina, has ran into several defaults since 2000 and has enormous problems with organized crime (which is, by some, linked to dollarization, as dollarization decreased the income of poor people with informal jobs, and drug lords are recruiting them easily).
The better alternative in my view is a regional currency with Brazil, the main trade partner. I can think of some alternative ideas which could include a state-sponsored stablecoin based on commodities, but they're not discussed in Argentina (although commodity-backed stablecoins do exist there, for example Agrotoken).