Hi Gabriele,
I tried something similar when I was new and ambitious at the beginning many years ago but you know what? Don't. It's not worth it.
The problem is the wind direction indicator (arrow) is not 100% accurate to start with. Sometimes it changes in accordance with camera angles and sometimes it doesn't unless the camera angles are dratically different or opposite to each other, front & rear views for instance so just take it as a rough guideline but never as a definite or ultimate game changer, you'll be very disappointed and exhausted otherwise.
I've personally compromised with a clock face like this one here.
Good luck.