Sorry, fire'y topic.
Quite a few of the track day vic guys have GPS timing now, including myself (racechrono + qstarz). It is just that natsoft is the benchmark.
I can see that it is more of a 'social fun day', which is great as passenger laps are great fun (Tampered Motorsport run passenger all day at Winton as well, though with timing).
Have you discussed with committee and/or AASA about running timing and passenger laps all day, with the timing published at the conclusion of the event only?
Either way I should be signing up for some Wakie action.