APT is not on the IG shortlist, perhaps because it is in the trading halt for CR:
https://www.interactivebrokers.com.au/en/index.php?f=4587&cntry=australia&tag=Australia&ib_entity=hk&ln=
CITI not selling short MINIs, can just go long
https://au.citifirst.com/en/search/minis
Openmarkets, CMC? I don't know, not a CFD/options trader.
Maybe more experienced forum members can give you advice. I'm also curious.