They are intending to cover the entire country with the one aircraft. Or pretending to cover the entire country with one aircraft. The Air Corps don't even have three EC135s. They have two. It's a farce. They don't even have the crews at this point.
It's a figleaf of a service.
It's a classic example of the current Irish government's incompetance.
The only good thing about it is that it will highlight exactly what's wrong with the idea. Perhaps it will take the deaths of the crew of a helicopter to wake people up. Not the first time that happened.