Do you know if they are houses puchased by RFDS or are they renting them?
2 distinct groups, well that is a surprise!
That is certainly an expensive option and one that can lead to friction in the ranks very easily.
Things would have changed as it was probably not discussed much back then - the fleet was 3 or 4 C441's and a Mojave with the bulk of fleet un-pressurised PA-31's. Most Jandakot based pilots were rated on all and flew all.