I don't think it's idiotic to start with some of the reform ideas early - dipping a toe in the water.
And where you mention the disparity between types of owners/clubs, this is why I believe two tiers are the answer. Provide for both categories.
8 or so team NBL run by BA, mostly association based clubs, lower cap ($500k-700k at the most), etc. Then an elite tier of $1.5m rosters run by the Melbourne teams, Perth, NZ and so on.
Spreads the load of supporting BA, gets professional basketball out in front of more juniors, spreads the load of paying players and keeping them on court in Australia.
Make it accessible for the regions that always want to get involved but are deterred by high costs (Hobart, Canberra, Wollongong, Cairns, Darwin, Hunter and others), and then make it elite for the clubs that want to put on a show.