Yes it should become Tasmaniana's ten-day OLT. Given time matters..
The ferry can, and often does, actually add more options closer to the day (for small groups) as other (slightly bigger) groups book in, and I'd imagine would still pick up any time given enough $. Then again, on rare occasions, it can't run.
So too, there's almost always gonna be transport options, just not the cheapest, advertised or most direct ones.
Bushgirl, you could get past half-way (say PV turn) but is an hour in bed gonna a) make all the difference in sleeping through the night? or b) be worth the chance of a rooty, boney campsite? (There's some good options towards each end (as mentioned) but, especially in wet weather, you'll be confined to rocky ridges and steep creeks). Just more food for thought, given such a giant day i'd be likely to push through to Narcissus (and wake at 9.20

)