Hi Angie! I'm obviously from Australia and know a bit about Australian comics, but little about Manga.
So, I can generally only searh Google as you can.
First, have a look at the Australian section here on CB+.
This site here lists Manga comics set in Australia. I'm amazed, Australia must be the equivalent of OZ to some people living in Japan!
https://www.anime-planet.com/manga/tags/australia [Aside - there was, may still be, a book series by Mills and Boon. they were an English company and used to put out 12 romance books per month. A large percentage of them had a nurse or teacher from the UK who went out to Australia and met a romantic station owner [ranch owner] or Doctor or Bushman and had adventures and ended up marrying him. these look similar. ]
The site below will link you up with Manga groups and they will be able to give you a lot of information.
Manga Groups in Australia
https://www.meetup.com/en-AU/topics/manga/au/ John Ryan's PANEL BY PANEL was the first substantial book on Australian comics.
Here is an extract. You might find a Belgian Library that can get a copy of it for you.
https://www.comicoz.com/panel-by-panel.htmlSearch Google or preferably DuckDuckgo for Comics in Australia and then scroll down to the
Collections and the References sections. and the links will give you plenty to play with.
Frew comics is currently the only Viable comic company in Australia,
https://www.phantomcomic.com.au/Here is the home site of
the Stanleys,
http://www.cartoonists.org.au/stanleysThe Stanleys are annual awards given to artists in a number of categories (see below), voted upon by the professional membership of the Australian Black and White Artists