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I went to the hardware store and got an 8-32 x 3/4" "binding screw" to attach my house key to my f150 fob, only cost $0.95. Makes a great minimalist key "ring" if you don't like having a lot of bulk in your pockets. I wanted the key to stay tight to the fob and not rotate freely, but didn't have a small o-ring handy, so I used an earbud tip replacement and it works great. You could get a longer binding screw if you wanted to add more keys.
I like the idea. I have the electronic house door locks, with a key backup. I keep the key on a fob in the glove box of the truck incase I need it. The rest of the keys I use are for the truck and trailer, they stay in the center console on another key ring. So my fob sits alone in my pocket with an Apple Air Tag attached to it.
I like the idea of pretty much no keys in my pockets anymore.
I go through the garage door and have a keypad on the front door. I hate keys. Could slide that key into your wallet?
I'd like to get a keypad on the front door one day.
As for a wallet, I use a thin alluminum card holder with a trigger (Code 118) that only has space for about 6 cards, plus I like having the key easily accessible.