Hi,
You will be grand doing it that way. The IAA and CAA have a bilateral agreement so you can train in either country with either license.
I was in the same boat a last year with a CAA PPL and did my CPL in Ireland and just brought it into the IAA and they gave me a new IAA License. Any questions ring a girl called Lorraine in the Licensing Department in the IAA. She knows everything about everything to do with licenses...... And very helpful too.
Best Of Luck
John