Arm. It's not smart for organisers to advise pilots not to comply with a CASA wind back requirement that was actually sent out in a special notam.
They would most likely end up with a prosecution.
You are suggesting this could be solved by lots of discussion/ approvals from CASA.
Why not support that we go back to the Aus NAS requirement of using the multicom at these un mapped airports.
Then that would require the leadership at CASA to say an error had been made.