Thanks for that Bronte. I did check about the funding and it is possible - might depend on the LTV but I guess if you're putting up a half or thereabouts they should be interested. Had a call with these folks
www.newmoney.ie and they were interested - rates vary from 4.5% to 5.25%, this company also does interest only (which is not the goal but just FYI).
I take your point on a possible significant other coming out of the woodwork
but at least he'd have the option to cash in and convert his equity to US$ and he'd be on the ladder over there.