IMO I think you have to go with Interactive Brokers and actually buy the shares from the exchange in Argentina. I bought a few shares of VanEck Vietnam ETF and it just sucks. Trading is hard enough with out all this other execution risk/spread/bullshit stacked on top.
NRS, Years ago, I had used IB because of lower fees. However, I don't trade frequently, and prefer another broker. Not worth my while to switch brokers for a specific asset. I rather skip the asset in that case. Thank you, Larry