This idea came from a published author and user of MMC devices, Brenda. She has created a list of potential ideas for devices. This post describes one of the device ideas:
The goal of this device is to aid the user in attaching keys, dog tags, or other items to split rings. This device would be intended to be used by individuals who struggle with limited hand mobility and or limited pinch grip strength. Being able to “open” the rings and attach the new device in a way that wouldnt require high levels of grip strength. There are a few different commercial solutions to aid with this but all require grip strength or a pinch grip. But these products may spark some ideas so I will link some of the ones I found below:
We are looking for a designer/maker to develop this device. Brenda is open for contact for any feedback or details but currently is not on the forum, so feel free to reach out in the comments to be put in contact.