If Red Bull wanted to pick up a team outside of England with a view to moving them to the English system, why would they look to Ireland rather than Scotland or even Wales ?
A number of Welsh clubs already play in the English system. And if they wanted a team on the cheap Scotland has dozens of them. We're much more likely to see a Scottish team in the English league system again (ref Gretna) than an Irish one, and I doubt Red Bull would fancy their chances on either. They're into brand building, not speculating.