AUS beat IRE by 42 runs and repair some of the damage to their NRR, but will probably still not be too happy having had IRE on the ropes 5 down early in the chase. Lorcan Tucker for IRE made a game of it until he ran out of partners.
I'm sure it must have worked a couple of times, but in general I don't rate dropping Malan down the order.
Particularly when there's still 10 overs left when the first wicket falls.