Jomor, get a cover. It's the best you can do.
I have a cat and she's a sweet.
She only got up of the bonnet a couple of times but she didn't scratch anything... I did consider get an Alfa red cover but she haven't done that since that time so, I wont get it. After all it's about 100€
I remember on time, many years ago, one of my uncles drove to the north, about 80km. When he stopped for the first, he heard a cat mewing from the engine bay. He opened the bonnet and there he was: a small cat that travel 80km from his home place!! And the cat was really ok!
Btw my uncle had a Peugeot 505 or something.
So, if you don't want a pussy sprayed in two you better consider a cover
wink