I think a similar model to the QFRS would work in adelaide. We have auxiliary stations in the regional towns and fringe city areas. And that is supported by the Rural Fire Service which is completely volley who just respond to grass fires, having smaller stations (usually one appliance, sometimes a QRV) spread in-between all the auxillary stations. Auxiliaries have a minimum two week block of training to get on the truck, followed by another week for hazmat, road crash rescue. All paid. Although the bushfires up here are really nothing compared to adelaide, But ofcourse no one does it for the money (it's quite dismal after tax) but it does help if you need to miss work, family events, sleep.
Naturally with the CFS and Adelaide itself there'd be a million and one problems to get that started and I don't ever see it happening, especially with such an established organisation.
But where I am it is effective in retaining the experienced staff and encouraging younger headstrong people to join and stick around.