'...doing a wide variety of all of the different types of helicopter work there are all over the world, from logging in Canada, to fire fighting in Greek forests, to heli skiing in the Alps, to learning Portuguese and flying the heli taxis of Sao Paolo'
Ummm, no. To paraphrase president Bush: there are already a Brazilian people flying the heli taxis of Sao Paolo and the last thing they need is a pom to come and do it for them.
But don't let that discourage you: there are indeed international jobs out there, often in support of oil and gas exploration and production, so with a few years' experience in the North Sea you should be well positioned to take advantage of those opportunities.
Other than that, I like your plan. Do it!