Another website might help you out. There is a custom set of roundels for A&A available as a picture on the BoardGameGeek, filed under the A&A Europe 1940 entry. This picture has two sets of 12 roundels for use in A&A G40, arranged as below:
First 12 - ANZAC, Nationalist China, France, Iron-Cross-Style Germany, Italy, Imperial Japan, RAF-Roundel-Style UK, UK-Flag-Style UK, Soviet Union, Pre-War-Style USA, Netherlands, and Maple-Leaf Canada
Second 12 - All except Germany is the same as above, Swastika-Style Germany
This picture can be found at: https://boardgamegeek.com/image/998141/
I hope that helps.
-Midnight_Reaper