They should be able to. I lived in Sydney and I participated in the three colour J. Herbin 1670 ink drop and I received the inks in 2 weeks which is pretty quick considering it's going from France to America to Australia.
That is actually a very good and interesting question.
I for myself are very colour specific. I do write and sort of collect "bluesih" colours. On a regular base I write mostly with blue black inks, in private I'm more into deeply saturated blues like the Sargasso Sea from Diamine.
So I would say that I would like to see colour specific, cross branded inks. There are a few I really would like to get just for collecting them.