Hodgy, my advice to the club would to be as thorough as possible. I know little about South and couldn't comment about the quality of applicants within the club. When these opportunities arise you might as well cast as a greater net as possible to find a coach. It seems to me you have 4 choices:
Promote a current South Coach eg Green, Manning
Recruit a former ABL/State League coach from another Club - eg Pricthard, Ryan, Spear
Recruit a current Ass Coach from another club - eg Castle, Grocke
Recruit a credentialled junior coach from another club - eg Butler, Arnott, Rigoni, Leaver, Combe, Bennett etc the list goes on.
Neil Gliddon is one person worth speaking to get an opinion on oustside applicants.
In the end the club might still opt for a "South" person, but they should do themselves a favour and look around.