Leafie,
I actually think there is a greater chance of success leveraging off the S&FP than starting afresh.
There is less dilution of the vote, and GA could bring significant numbers to the S&FP.
They are the only common sense no BS kind of folk on the political landscape at present. I have never voted for them and never been a member, but they make more sense than the rest of the numpties, including the Liberal party who have had my constant support for all my voting life.
When the Libs or the ALP start seeing sensible folk swinging away to "common sense" you might get more overall impact.
Just my $0.22 inc GST worth.