Show photo please!
I understand your frustration.
It is a good question.
I think the biggest problem in creating the photo you are looking for
Is the distance between the earth and the object casting the shadow.
If a moon sized object was halfway to the sun, no shadow on earth.
If the moon sized object was 10 ft off the ground, shadow about the same size as moon
Somewhere in between should give you a shadow (Umbra, not penumbra)
That is smaller than the size of the moon.
I'm not sure you can recreate that on the surface of the earth.
Great mind exercise though, thanks.