Yeah indeed, one of the main things against the UAR turning professional is it probably can't afford the best Argentinians. It'd certainly test the depth of rugby there.
Yeah I dunno who exactly my 5 Other Nations would be, maybe, Italy, Argentina, Tonga, Samoa, Fiji. Japan. In which case I suppose it'd be 6 More Nations instead.
An interesting thing would be a champions league kinda thing with union teams. I'd be more into it as a novelty than as a serious realistic tournament though. Ah well, that's what videogames are for I suppose.