The Commodore was exported to the UK too (no conversion required but a limited market due to fuel costs and road salting), and some Middle Eastern states. Not sure if the quantities were ever large enough to justify it.
I doubt that Holdens would have had a harder time with salt than Brit cars-------at least, back in the day.
I saw Pommy cars on the road there which were so rusted out, they would have been compulsorily put off the road in Oz.!
Holden did well in the Middle East back in the 1970s, & the "Chev Kommando" or something like that in South Africa was the previous year's Holden.
Of course, anti-Apartheid sanctions killed the ZA market.
They also sent a few Statesman bodies complete with every thing but the engines to Mazda in Japan, who put twin rotor Wankel engines in them.(One of those things car makers do when they are stuck without a model for a particular niche.)
Ford also sold Fairmonts & XA GTs in small numbers in the UK, as well as Chrysler with Valiant VIPs to try to fill the niche vacated by the Humber Hawk & Super Snipe.
Back in the '70s I also saw quite a number of privately imported Holdens in the UK, maybe brought home by Brits who had worked in Oz or NZ, or more likely the Middle East, & they were not "rust buckets".
It was a weird sensation to look out of the train window & see a HD Holden wagon sitting at the lights, all decked out with sun visor, etc.
Such were so familiar at home it looked normal, till I remembered where I was.
GM imported late '50s & early '60s Opels into the USA, which were quite dire, compared to the equivalent Holden.
The tighter the grip of Detroit became, the less chance Australian subsiduaries had of achieving export success.
However, development was simplified because Holden was using a common platform, which GM had designed from the ground up to be international. It's that cost which GM presumably expects to save on new designs. The sad part is, it's probably not a large proportion of the platform's cost, and increases the barrier to entry to growing markets like India.