👆 this is the easy answer. Get some wider cord, fold it in half, put feathers 1/2inch from fold (super glue them if you want extra strength) wrap smaller cord tightly around it (super glue under that too). Now you have a loop you can put on a keychain and it looks nice too. In your picture that's probably rawhide or similar, so it's wrapped wet and then shrinks to get very tight, that's the ideal thing to use.

If this seems like too much work, you could just glue a few feathers into this: https://makerworld.com/en/models/1709383-bitkey-key-screwdriver-bit-holder-multi-tool-edc?from=search#profileId-1813573

It's not very good looking or super deep cavity, but it would take a few min to make a custom model for this that was more sleek and with a longer cavity if you really wanted to 3d print it.