Thank you, gents, it does help. Vlad, I agree this is the most logical supposition. In photos of JG54 F-series planes, they look to carry repainted black crosses on their wings. But that was when black wing crosses were RLM standard. As you know, G's typically had white outlines only, perhaps filled with dark gray. So not overspraying them makes sense.
Pat D, your photo is extraordinary. It looks like it was taken just as the ground crew is applying the camo! And there are no wing markings to be seen. And behold! White prop blades!
It's a close call but I think I might go with no crosses.