To be fair to everyone you'd need to be able to sort this out as early as possible for promising players so there was nothing except opportunity holding them back. Here's a thought - how about FIFA waives the requirement for kids aged under 15 when they got citizenship - that should cut out any of the real 'talent-harvest' concerns. That would reduce the load of exemption applications to those cases in the 15+ age-groups where there dodgy stuff may mostly occur. They need to do something as its blatantly unfair on innocent parties.
So what would then stop, let's say, Qatar from shipping over 2,000 14-year old Brazilian boys, giving them all citizenship - if only 1% work out as good footballers, Qatar have an instant competitive team. And they can then just press repeat on that.
A lot of people are looking at this from a very insular perspective - in the grand scheme of things, Wynne is just collateral damage in FIFA's fight to preserve competitive integrity of international football. And they recognise that there are occasional issues with the rule, so they give exemptions to players who demonstrate they're not cheating the system. And if NZF had bothered to do something about that - like the FFA have been doing - none of this would have come to pass. So who's at fault then?