I briefly read an Australian "Yellow Peril" novel from the turn of the 20th century, where the author posited that the Japanese government would stage immigrants via Taiwan and land them in the Top Half, sort of as "starving refugees". They would train and prep them carefully for tropical living, then send waves to the Top Half, where they would form refugee camps (different language used) and start to form small settlements, all the while the Japanese government appealing to international public opinion about starving refugees, empty / under utilised space in N Australia etc. Then after a year or so, there would be many tens of thousands (IIRC) of Japanese safely settled far away from any Australian settlements but very hard to dislodge without military force, in which case Japan would step into protect their citizens.