Double Irish With A Dutch Sandwich - it's dead(ish) Jim
I realise lots of people really don't like the "Irish double Dutch sandwich with extra ketchup bullshit" strategy, but there's no reason at all why this won't work afterwards. Arguably, it'll work even better than it does now.
Nope, the Irish government closed their part of the loophole in 2015 and pre-existing structures can only run until 2020.
See here for an explanation of the whole thing.