There's a William Hookway sailing from Melbourne to Sydney on the "Wonga Wonga" arriving 15 Nov 1866. Certainly easier to get to Yass from Sydney than Melbourne.
No sign of any other Hookways on the ship though.
Hookway seems to be quite a common name in Bideford. A William Hookway, wife Ann and ten children (including another William) arrived at New York on a direct sailing from there in 1837.
There are also at least two seamen, James & John Hookway, born Bideford c1840, listed several times as crew on ships arriving at Australian ports.