I would like a key fob that holds 4 keys that can be ejected/retracted on a button press. There are a few existing designs out there but only for single keys (or plastic blade - I am not interested in a blade! but the design could be modified).
Having compact size is ideal. Two keys facing one way and two the other maybe. Or similar to the keyport design (which always seems to be sold out). That design is a manual push rather than a spring or elastic loaded concept.