If you don't have time on type I wouldn't recomend it, they are mean and racist, they don't want you here.
Does the people or the government of UK or anywhere else allow to recruit any expat pilots?? I don't think so. PERIOD.
So by Korean not giving any upgrade to expat FOs it is very logical and it makes sense. Unless UK, AUS or North American countries would be giving the same opportunities to any expats a chance first without being an EU national or a Green card Holder than there's no arguments.