There’s a stack of NZ players in the NRL.
The talent pool argument doesn’t hold much weight until NRL clubs have exhausted raiding Union in NZ, the Pacific Islands and South Africa. We’ve been picking up some decent Union players from NZ and the Pacific Islands already, but there’d also be a stack of Union players in SA playing lower grades who would make decent RL players for relatively cheap. Some would jump at the chance to leave too.
Same goes for Europe, you could pick up some decent backs out of the lower grades there who’d like the chance to get noticed in first grade in either code. If they leave later, so what, replace them with another.