Totes agree with ChrisJHC re: section combos.
...just want to add that if you're driving to the walk...then it's worth parking the car near the end of the walk at Princetown Reservation ...cheap camping with hot showers and some power points to recharge devices. I paid $15pn for camping (1p) and $20 for the week for Mick the manager to watch over my car.
Also, the Vline bus delivers you cheaply to the start of the walk (start either at Apollo Bay or Marengo) $10pp (I did it in May and the buses were running Mon, Wed, Fri - just check what their schedule will be for mid winter).
Both companies are easy to google.
I also combined my fifth day ... Ryan's Den to Princetown. From Princetown it's only 6km to Gibson Steps which is the last site on the trail - tbh I drove that bit tho
Also if you want a nice and also affordable night in Apollo Bay - the YHA there is really very good.