A few days ago I wrote an article about using your Filofax as a wallet. I have a few more candidates that could work well for you.
The first one is the Filofax Kensington in personal size. This leather is gorgeously soft and it has lots of credit card pockets, a zip and a slip pocket for notes. It is not bulky or heavy and the cover wraps around the contents like a hug.
The Swedish Journey in pocket and personal size. This is probably the best designed Filofax/Wallet I have ever seen. Full size rings and full wallet capability.
Pennybridge Compact Zip – same layout as the Malden but non-leather so much cheaper
