Update:
As I said a few months ago I decided to research about this and try it out myself. I went to Buenos Aires, but unfortunately it is
not possible anymore to do it the same way. For anyone interested to know why this is how it went for me:
The day I arrived to Buenos Aires I started by getting the Certificado de domicilio at the tourist police station on Av. Corrientes. You can legally use your hostel address (as I did) for this. This went very smoothly, the nice woman prepared the piece of paper on the spot. She also said that normally you should apply for this online (this is true) but that she would do it now because she knows it's a process that can take up to a week.
Excited and now with domicilio I went to a gov office to apply for an appointment (turno) for the test. You can go to any office, I went to Subsede comunal 3 at Moreno 2301. First a bit confused I did not have an Arg. DNI identity number but just a passport, the kind lady went to talk with her supervisor. She came back and said it's ok and made the appointments for me. One for an obligatory online theory lesson of 3h and one for the exam day at Av. Roca 5252 only about 5 days in the future(theory test and practical test on the same day). This was the moment I thought it's going to work!!
But on the day of the exam (well-prepared because I found some theory questions on internet and not worried about the practical exam) I arrived to Av. Roca with my passport and certificado de domicilio and just before the exam I was told I needed another document called Certificado de Residencia Precaria. This document, valid for 3 months in most cases, was needed to put the expiry date on the license. I tried to get through showing the domicilio paper and my digital entry card that shows I am allowed to be in Argentina for 3 months, but the lady was flrm and said I needed the Precaria. Asking for other ways to solve this issue didn't work either.
Now, I sort of knew this document was needed as it says on the internet (see previous message) but since I got the appointment I figured there wouldn't be any problem. This mistake cost me a weeks time.
Knowing that the Precaria might be needed I did research at home in Europe (
https://buenosaires.gob.ar/tramites/...encia-precaria) and prepared one thing before my trip which was the certificate of good conduct (certificado de antecedentes penales). So I decided to try this as it was my last and only chance..
This can be applied for on the internet, uploading all necessary documents (I had to get the cert. of good conduct translated by an official translator). The problem is the reason I was applying. Eventhough it is not clearly mentioned on the website, there are other websites that show the valid reasons for this temporary residence. Basically you are applying for a Residencia Temporaria (
https://buenosaires.gob.ar/tramites/...cia-temporaria) and the precaria is just a document that is valid when the temporaria is still in process. Since I didn't apply to study in BA nor did I have a work contract my only chance was a applying as a rentista and even this was a long shot. I showed bank accounts I have but was missing proof of property ownership. So naturally when I had my appointment at the migrations office, it was declined. Another week lost.
However, one minute after uploading the documents in order to get that appointment, you are sent an automatically generated residencia precaria valid for one week until the appointment date. I seriously considered just changing the expiry date using Paint, and showing it at the driving exam. I am pretty sure I would have gotten away with it but finally I decided not to do this as the fines for falsification of documents by public organisations are quite high (years of imprisonment). Also the document can be checked digitally by website and by QR code.
With little hope I went back one more time to Av Roca with the one-week-valid (and now expired) certificado precaria and the digital entry card, but as nice as the conversation was (and asking for other ways to solve this problem) they would not let me do the exam.
So I went back to my hostel and booked a flight to Santiago, where I just bought a small 4x4 instead of a bike. So I did not get the motorcycle license. Maybe there are some unofficial ways in Argentina to get the license but I did not know how to do this, and I don't know the right people I guess. I'm sure lots of people ride bike without a license in SA and I believe people are rarely asked for the license by the police but I did not want to risk having an accident, in which case the insurance is not going to cover anything.
In total I spent over a month in Buenos Aires and around 200€ on documents and transport to Av Roca, but I still had a good time there.
If I knew this I would have spent the extra time and money to get the license at home in Europe, but I consciously chose this option, so I do not regret it.
Now another adventure awaits me, travelling south america in an old 4x4 suzuki ????
Good luck to everyone on the HUBB!