If the company accept an ICAO licence there is no requirement to convert and you simply get a " letter of permission to fly" from the DGCA, it replaces the old " validation system" there are no tests or exams. To get an irish licence you need an accommodation address in Eire, it's not as simple as just applying, you will also need an Irish medical check and various other bits of paperwork, can't see the point of this process?