Welcome to AFF
@MelbourneBoy
In
general, reward flights in Economy are said to be OK, although to premium destinations such as London and USA can be short supply. How and when Qantas releases reward seats I think is more irregular these days than historically. Sometimes they release a lot at one time, other times they seem to dry up completely. Release after a cancellation maybe taken back to general inventory.
Correct, you can only upgrade Qantas flights with Qantas points.
It is very 'risky to buy, say, an economy fare and then hope to upgrade with points, especially being a QFF Bronze (sorry)
Unless you get an Emirates redemption, you'll almost certainly have to fly via LHR, which would be expensive and time consuming. I haven't considered Chinese partner airlines of Qantas.
Suggestions:
* Look for Qantas reward flights to Rome or Singapore and fly onto Athens from there on a local carrier.
* Use your Qantas points for a hotel in Athens for part of the stay -
for example here.