Well, Buenos Aires' prosperity in the late 18th century, which ultimately led to its ascension to viceroyalty, owed a considerable amount of that prosperity to the fact that Buenos Aires' merchants were shamelessly trafficking in British contraband. In all honesty, the invasions themselves were a major contributing factor to the first feelings of acrimony between Buenos Aires and the british.OTL Buenos Aires fell quickly as the attack was unexpected. Much of the unexpected part was because it was a rogue operation. The reason it failed was that Britain wasn't expecting to launch the invasion, and didn't plan for a follow up. Thus the conquering force was left exposed when it became obvious no backup support was on the way.
In a coordinated attack, with follow up support, that part is resolved.
In Brazil, 1809, when the markets were suddenly opened to British wares, the markets were flooded with stuff that was inappropriate for the region, displacing local vendors, generally causing chaos, and a lot of bad blood ensued on both sides. Somehow, I doubt an open market is going to be a magical 'hey everybody, let's throw down our arms and join the British Empire' movement. But, it could happen, I guess.