Myler and Mahon are the only two we've appointed externally, although both had links to UCD of course (Mahon's son was playing for us at the time, and Myler started with UCD and is working there now)
Agree though that there's a lot of managerial inexperience and you seem to get one or two roles and then leave the league entirely. (Liam Buckley being an obvious exception). Feels like a particular problem in Europe.