The plan looks sound and I feel if these individuals are going to use the NDIS budget anyway, they may as well recieve a service that suits their needs.
I reckon they should buy or build small to medium size facilities around metro areas nationally, that provide accommodation for small groups of these individuals. It would act as a safe place for them to recieve services such as recovery, personal development and transtioning into independent living. Each centre could have a small number of rostered and rotating live-in caretakers and all other service providers can visit the facility as needed. Not only could it be more efficient on the NDIS budget, due to the reduced cost of servicing a group rather than dispersed individuals, it could also bring economic value to each area through jobs and investment.
Lots of details to work out, but we are only limited by our willingness to imagine.