That hollyhocks cover is gorgeous! You’re so lucky to live near Dromgooles. My own local stationery shop closed a couple of years ago, which makes me sad for so many reasons. Thinking outside the box for your covers, maybe you could use one to hold a book you are reading.
Hobonichi recommends not to use coc on the leather over, as the coc contains plasticizer additives, which may damage the leather dye and affect the colour and the quality of the leather