Don't like your chances if you're talking about the clearance stuff...
https://help.danmurphys.com.au/hc/en-us/articles/360000043436-Lowest-Liquor-Price-Guarantee-
If it's just a redirection not a change of address or anything fancy, you should be able to redirect it after their redirection in MyPost assuming your MyPost address/email address matches your Qantas Wines details.
It's no Zalto, I get that but if you must buy Penny's then this should lessen the damage to the wallet. Hey Christmas is coming up, nothing quite like re-gifting these.
https://www.penfolds.com.au/riedel/Home/LandingPage
Spend $250 or more on Bin 28, Bin 311 or Bin 23 and receive a pair of Riedel glasses (Performance twin pack - $99) for free.
Mycar don't sell gift cards, they've even stopped accepting CM gift cards a little while ago. Somehow they've still accepting Flybuys. The store i went to will happily split the charge over multiple cards.