Mint Sauce ones were a MBUK freebie back in the day.
There have been two, one from around fifteen – twenty years ago, and one last year.
I’ve got both, never used them for their intended purpose, though.
Thing is, anything can be used as a keyring, so long as it’s got a hole that a split-ring can be put through. My main keyrings are a ‘REMOVE BEFORE FLIGHT’ label attached to my car key, and a length of paracord, one end of which is wrapped neatly around a large ball-bearing, the other end knotted onto a split-ring with key, small knife, small flashlight, and containers with ibuprofen and hearing protectors in.
Has the effect of stopping my keys falling out of my pocket, the weight of the steel ball holds it in my pocket quite neatly and acts as an anchor.
The point is, you can make anything into an effective keyring.