Can any of the experts on the focal blade plug in advise on how best to sharpen without creating a lot of noise in the sky area. It doesn't appear to have a facility to select and invert the sky to hide it from the sharpening process
Before running it, create a duplicate layer. Then run focalblade. Then go back and select layer mask>hide all, then use a white brush of varying opacity and "paint" in the sharpening only on the areas you want.
Flatten. never appy sharpening to the entire photo when only certain areas need it.