I think this Addtional Eligibility clause is an excellent idea BUT...there is just one problem that I can see, a potential loophole which could well allow a back-door entry for NZ born foals to the APG.
Seeing as how that Series is open to Australian born foals only, some sort of distinction must be made during the registerstration/branding process for these weanlings which will serve to highlight any previously unbranded/unregistered weanlings as actually having been foaled in NZ.
If, at the point of DNA & Freeze-branding a NSW brand were to be applied as per the normal procedure...I'm concerned it could well prove to be impossible to tell the difference between the Oz & the NZ born foals come APG Sale time.
I've mentioned this to the crew at HRNSW, maybe they already knew, maybe they didn't. As long as they're aware of this aspect and make note of this in their database so that these weanlings don't start showing up in APG Sales then Bob's your Uncle. Good idea.