Hey! Joining in! Sounds so fun so far!
My DH's absolute favourite place on earth is Ireland. He is actually mildly obsessed...anything and everything having to do with Ireland!!!

It is his equivalent of my Disney!
My kids names are Katie and Declan...had to be Irish! (And there aren't a whole lot of Declans in Canada!)
We were in Ireland back in 2000. We flew to Dublin, drove to Galway (probably our favourite part), then circled through southern Ireland, ending up in Dublin to end the trip. We are looking forward to taking the kids back again, and this time also doing Northern Ireland as well.
Anyway, your trip sounds great, and how exciting to introduce you DBF to America and the Parks!
I think it is a wise thing to avoid the Parks on July 4th as you have planned. One year we were in the MK on July 4th, and let me tell you, it was a complete nightmare! I would never do it again!!! The crowds are too much to be enjoyable.
As for shopping, I would totally vouch for both Prime Outlets (on International Drive) and Premium (off I-4). Like you, I am not an American who has easy access to all the great outlet shopping in the States at home, so shopping is always part of my vacation plans. I also like the Millenia Mall (about 20 minutes up I-4 from WDW), but you can get much better deals at the outlets for sure, so I would choose those over Millenia if you had to choose.
Good luck with the vacation planning! You are so close now!