Because policy wonks here actually use references to Lord of the Rings:
the Rohan Rider
Excellent! So either you reset the salary and interpret it 'weakly', and the Saxby fix works. Or you interpret it totally literally, and the Rohan Rider works.
Or, I suppose they could officially not appoint her until her senate term ends, and just let her fill the role on probation.
I have a good friend called Rohan, who works in the Foreign Affairs department in Canberra. He'd be mightily amused by this.