The first 3 on your list have got no hope, as you well know. Would have to consider Clarkson, dependant of course on the quality of his resume, and how he presented at the interview.Contenders for the permanent job:
Robert Harvey - if Colliingwood start winning games the second half of the season, he moves into favouritism.
David Teague - would not surprise me if he ended up as Collingwood's coach if Carlton sack him.
Mark Williams - Choco's reputation just grows. Perhaps the most respected assistant coach in the competition and would be a steady hand at the club he captained in the 1980s.
Alastair Clarkson - if he does leave Hawthorn, the infamous Collingwood cheque-book will nab him.