Thanks for the info. I think I'll hang fire and see if there's ticket news nearer the time then, assuming as it's not going to be a sell-out.
Getting home tickets in Italy is straightforward but for the occasional Euro games I attend, it can be complicated due to security and needing to buy from Italy. I usually get one of my Italian friends to buy and bring over. Last time was the Hearts match in October and I got them via the Viola Club Brussels. There's a few other fan groups based in Europe that like to come over to UK games e.g. London and Paris, so I'd expect a few hundred fans maybe, whereas it would be 2-4k for a competitive game.
I'm assuming that there's no need for proper segregation for this but maybe Newcastle will want it as there's fans from 4 nations in stadium at same time? If I can't get away tickets I'll grab some in a Leazes section nearby. At least the hotel is booked!