There are a couple of issues you need to take care of, or at least be aware of, before quitting. First, as you alluded to earlier, emerging market stocks are not generally used when calculating the 4% rule, so I'd hesitate to use that as a target without further research. Even so you're about halfway there right now. Second, you're in a position where re-entering the workforce will result in a very significant ~80% salary cut. This means it will really benefit you to get everything right the first time instead of having to go back for another job later in life.
You mention a pension, is there a cash out value of that you could take instead of waiting until later? If that's an option it may be worth doing if you aren't certain of its stability.
As far as your expenses over time rising due to country development, I wouldn't be TOO worried about that. If cost of living increases, chances are wages will increase as well. It still may force you to go back to work, but your wage would probably be enough to live on.