Maybe you can get one of those plastic credit card holders to put inside the denaro? I'm a person that likes to carry a lot of stuff in my wallet, so what I did was used the two card slots for my ID, paper cards like First Aid/CPR, and my debit card. Then I use the coin slot to hold about 5 cards, including a couple of credit cards, Costco card, etc. And then I have a little Pochacco tin to carry coins. It worked to my advantage because now I don't carry what I really don't need anymore as far as cards go.
So yeah, maybe use plastic credit card holders?