Am i missing somthing but i would have thought that all you would need to do to make irish regiments is to paint ordinary sets with the faceing colours and colours of irish regiments as unlike highland regiments their uniform was almost identical to the armies the regiment was fighting with e.g the revell nappy british are shown on the box art to be the 27th inniskillen an irish regiment irish regiments in french service such as dillons had basicly the same red british uniform of the 1740/50s period so again just need to use the correct regimental colours and the yankee fighting 69th just need the famouse green erin go bragh colurs with basic fedral uniform and hey presto another irish unit

Long Airfix Ancient Britons to Caesar S.A.S.

Longer - Caesar Chin Chinese to Caesar WWII Chinese

Longest - HAT Sumerians to Caesar Modern Urban Resistors

The point that you are missing anthony is that while a myriad of figures can be painted or converted into representations of Irish regiments -something that I have done myself- the fact is that no figures have been released that are specifically made by the manufacturer to be Irish, as such Irish figures are under represented in the hobby.

Germany?
Frnace?
England?
NO Italy with the all sets of ancient Roma,a lot of midieval some WWII and the future sets of WWI and Garibaldi of course ( to say nothing about Atlantic series )
Anyway, regarding Ireland, i personally consider britons and celts like natives of this green island.
To streelts a sets of Brian Boru it will be much appetible]