I wonder if they just can't get the volume required to set up distribution. Bit of a shame that you've found communication to be poor. They must be focused solely on the local market, that's where the money is, not many people from overseas are going to buy old Holden or Ford road car models. Racing versions can be a different story however.
Which retailers have you dealt with, if I may ask? I deal with a couple of good ones. It's just difficult to avoid the big postage costs no matter who you go through.
Interestingly, their new Vegemite Holden Panel Van is made in Indonesia, not China. I think this is the first model they have done from a new manufacturing base (I'd have to check if the Arnotts Panel Van was China or Indonesia as that model was the first with this tooling), and they're not the only ones moving away from China. Looking forward to seeing what the quality is like, initial reports seem to be good.