The Pacific Islands aren't the same as the UK in terms of being four countries in one. In fact I'm not certain, but I don't think anywhere else in the world is like that!

As a country we're in quite a unique position. All Olympic sports compete under the "Team GB" banner, boxers, motorsport drivers, etc are all stated as "British", so it's not just rugby union that uses it. Even the Ryder Cup team was originally GB+I before becoming Europe I think. The cricket team is England and Wales. If RL was played professionally in all four home nations then it would be worth competing separately. It isn't though, so yes, I think each should operate separately as a development side with only one, GB+I, Test side.

Again, I'm only talking about the British Isles teams, not the whole of rugby league, so Tonga and the rest have nothing to do with this.