Bring-along button - bracelet, necklace, ring etc

Just bought a key fob from klikaanklikuit that works really well with homey and my flows.
It made me want an even handier button for my system.
Key fobs are handier than most buttons but I am thinking a button on a bracelet, necklace or even a ring.
I am not interested in buying a smart watch for 100s of moneys. I’ve had enough of issues with those to last me a lifetime.

What I want is a simple button that is attached to me.

Anyone seen anything like it somewhere?

Also, is it possible to see all kinds of devices that are in the different apps that homey has?
Would be quite nice to have such a list to get insight in to connectable products.