^I.e. delta neutral. In that case an at-the-money put and call pair will do the job. However, if the stock is in the XSO, then it's not likely to be available as an ETO, so you're forced to deal with over the counter options in that way. Hence, your reason for needing the index...
... I don't have any better answers, sorry.
For the record, the commsec financial services guide explains the solution to my problem: They will buy the stock at market and sell it to the counterparty at the strike price through ASX clear for a fee of $33, on top of exercise and brokerage fees.
