FAA licenses are also accepted by the authority, just with additional exams and requirements meaning more time on the ground.
I believe the airline is still working with agencies (saw Sigma's ad on the Flightglobal site) but also by WOM through previously hired foreign pilots flying on the line.
Regarding "perished goods", I heard that each batch of foreign pilots has one or two that don't make it and the company is trying to make sure these are weeded out before they sit in the ground courses and start their line training so as to reduce expenses for these dropouts.
I believe they still have multiple recruitment days a month for both A320 and B738.