Hey how are you?
I like the ambition,, what you suggest is possible, not necessarily enjoyable, but certainly possible.
Have you done any of the MB trail? You are aware the MB finishes at Collie? If you were to continue to Albany it would be by road, yeah?
The equipment you need to do the ride from Perth to Collie, Collie to Albany & Albany to Perth, may not be the same type of gear.
Cycling never gets any easier
you just go faster