So we got this cool little gimmicked wallet. What do we do with it? Card to wallet... yeah how boring. Here is an idea to spice it up, possibly being a prelude to the card to wallet.
If you do card to wallet anyways here is my little addition, even though a few bits need to be figured out. Open the wallet and show a face down card in one compartment. It's one of those wallets where a transparent window let's you see what is there. Usually for drivers licences and shit. But in this case you see the back of a card. Leave the wallet open as you have a card selected and signed. Free choice of course. Then the usual shenanigans and finally the card is vanished. You claim it's the card they've been staring at the whole time. Cleanly you pull out the card with no funny moves and it really is the card. The method is nothing but a combination of two gimmicks. One is the wallet and the other one is the transparent window in the wallet. It's basically the face down version of the Wow 2.0 gimmick by Masuda. So before any card is in the wallet the gimmick poses as a card. And once the card is in the wallet the gimmick becomes transparent. Now you got a miracle.
Do not load one card, load more than one. It is much stronger.
Borrow the business card of a spectator... look at it, wondering, then saying, "have we ever met?" Then reach for your wallet and inside there will be the same business card. Looking back at the first business card is has now become your own business card which you hand to the spectator. Do I need to tell you how commercial that is?
Have you ever played around with the option of stealing stuff from the wallet as well. That opens up room for transpositions and all of that fun stuff.