Rio Grande is approx. 370 nm
Safer for fuel reserve.
I guess they will let you land in matters of life and death.
Altough there is another democratic chosen boss in Argentina, they still roar when they are in economic down turn. This might slacken a bit now the oil exploration around the Falklands is not a complete succes.
However there might be a slight chance you have to leave the cab behind and take the airliner back. 😁😁
RGA - BUE - SCL - MPN. Make sure you take a few quit travel money with you or have your card loaded. Probably easier to fly to your head office to talk to your boss.
Cheers SLB