It is possible to do the northern route over N. Quebec-Greenland-Iceland-Norway non ETOPS, it added a penalty of about 35-40' to the JFK-BUD route. The EWR-WAW GC route would be more northerly, it woud probably not be very different from the non-ETOPS path. I do not see why continuing on two hyd systems plus two generators and a functioning APU would be in breach of any rules. In such an event our procedures would have been to check position, distance to alternates along planned route, and if all within limits continue to maintenance base rather than have a stuck aircraft at JFK. I'm sure the line of thinking at LOT would be very similar.