Hi!
As far as getting a validation of your JAA CPL(H) in Chile it's fairly easy as mentioned in the previous posts. However, the six month validation gives you only a PPL(H). If you want to work in Chile, doing aerial work, you need to obtain a full Chilean CPL(H): 120 question exam and a 45-60 mn. flight test, the validity of the licence will be linked to you having a working permit/visa in Chile. And of course, everything is in spanish, so you have to be fairly fluent.
There is plenty of work in Chile... and a shortage of experienced pilots at this very moment. There's several foreigners working every summer, mostly on forest fires. Your chances of getting a job will depend on your previous experience, if you have hours doing fires, external loads or mountain time, you stan good chances of getting a job.
PM me if you would like more info.
R.