I'm doing some work on a scenario which has a Central Powers-sponsored Ukraine becoming independent as a result of the Great War. I'm having difficulty on selecting the initial roundel, and so I thought I'd ask your opinions. Bear in mind that this is for early planes, probably up to the 30s. Ukraine's neighbors are Romania, using their OTL roundel; Austria-Hungary, using the same form as the second here except in black with a white border; Poland, using the checkerboard; and Russia, using their pre-revolutionary red/blue/white roundel.
The first one is a simplified version of the national arms, but I worry that the large yellow area may be too similar to the yellow disc of their Romanian neighbors, who they Do Not Get Along With. The cross is that much more blue, but I don't know if it might seem too Austrian - the Ukrainians may have a Habsburg king, but they're definitely their own men.