wheter or not it is possible for foreigners to work as ATCO
More than possible.
but the only real problem is that you must accept as the first unit, let's call it "transition unit",some of these solutions:
-tahiti twr/app/acc
-Bora Bora twr
also you must obey to their standard contracts for such units,full rated salary,plus overseas allowances and 24 hours /weekly working time.
At the top of these strong requirements you must know English language,and if you know basic french it is advance,not hard requirement.
after 5 or ten years at such dummy locations you will be given opportunity to apply for job at Perpigno,where you will work until late retirement at 45 years,or 20 years working experience whichever is earlier.
as you can see,it so easy,so you could meet thousand and thousands expat atcos,sending their CV,to appropriate french institution.
And they read each of these CVs carefully.
