Hi Janni,
I wash my old socks that get old (holes) , let them hung around and then use them as organza bags. Having not too short feet helps ...
I dispose some aluminum plates (from eaten cakes) around too.
I still have some pecking, but ho well.
For sunflowers, sorry to disappoint you but rats will climb on them to feed. The seeds on the floor will attract voles ... Well, you're free to do as you want, but be informed of that fact.
I stopped feeding birds because of the rats, voles and moles getting attracted... Just my experience ...