Yes, since Javelins will be sold via FMS. Test firing two to three missiles per year will consume the original order, with new missile replacements being purchased as expended.
Irealand, like New Zealand, has faced tanks in their peacekeeping missions recently, without any ablility to attack the tanks except for calling in close air support. The costs of having a modern ATM capability for their light infantry forces is not a budget breaker. One LAV costs more than a minimium Javelin order.
Furthermore, having already acquired the Javelin system, these countries will move to the front of the acquisition line buying more when necessary. If their 12 launchers are deemed not enough in the future, more launchers and missiles can be easily added at a later date.
Since Ireland doesn't have any tank forces or fighter/bombers in its inventory, Javelins is probably their best route to an anti-tank capabality for their armed forces, without buying tanks.