Would there even be much in the way of Jewish funding for such a colony? I imagine it would be dammed expensive to build basic infrastructure for a base town / port let alone wider development and then of course immigration and jobs.
It would be akin to setting up a new colony, given the distance from heavily settled areas.
Back then, the Kimberley was actually more populated than it is today, with a larger population and a comparable population density to that of the Aden Protectorate (present-day Yemen)- or at least, it
did have a larger population than it does today,
prior to the mass deportation of the Japanese, who had been the largest ethnic group in the Kimberley region prior to WW2. This offers a more cynical explanation for the Australians' motives in offering the Jews settlement in this region- to fill the vacant towns and cities left behind by the deported Japanese Australians. For the most part, these towns and ports already existed, as did the basic infrastructure needed to support the settlers.
They'd have been filling a vacancy. Not setting up a new colony, but moving into an existing colony (albeit a relatively derelict and neglected one, with the existing infrastructure and industrial base being sub-par; akin to Russian America or the Danish West Indies) after having purchased it (or, rather, been gifted it as a gesture of good-will) from its previous owners. Pearling was still a relatively profitable industry (albeit becoming less so), and the way was clear to exploit the Kimberley's massive gold deposits and diamond fields. The region's oil and gas fields hadn't been discovered yet, but they'd still be there in abundance, just waiting to be developed.