OK, heres some more info and options, drawn from whereis,
The Sunbus coach
and meltrip
we could leave the closing ceremony at 17:15. A little rude,
But we would be able to taxi to meet the shuttle bus leaving Southern Cross 17:35.
Per person, thats about $26 (=$7+$19)
Or, we could stay til 17:30, taxi to Werribee to get on the shuttle bus’s 6pm pickup.
Thats about $40(=$25+$15).
Or we could book a pickup by the shuttle bus direct from the Crest Hotel. This looks like a good option financially. $30 for one leg. Too bad its probably a departure around 17:05.
Refining my first rail-trip proposal above, a 17:35 departure would get us the most more Con time for a cost of about $23 ($6+$7+$10). It just requires prebooking a taxi, pehaps from the train by mobile once we are underway and can predict our arrival time at Little River.
There is still the one-taxi-trip-the whole way option.
An $88 fee for 60 km would actually be competitive with some of the above options once you split it down the middle to make $44 per person.