Whatever you do don't change any money into THB back in Oz before departing, the exchange rates at banks & currency exchanges in Oz is terrible, you'll get far better in Thailand, even the currency exchange at Bangkok airport will be way better than the rates back home.
So you'll need some baht immediately after landing so change some AUD at Bangkok airport, just enough to do you for a couple of days, then check out the banks/changers outside to find the best rate.
There has been a lot of recent discussion on this forum on using cards/bank accounts in Thailand. There is an element of risk when you use your plastic in ATMs and swipe it in hotels/restaurants/shops. Some folk are starting to go back to TCs as they seem less risky.
If I was you I'd carry the 3K out in $100 bills and keep it in a secure wallet around my neck or waist until i find the best money changer.
Best of luck with the surgery, I hope you have a speedy recovery.
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