So, after the car keys my daughter wanted house keys (because of course!).
Here is a set of keys inspired to the same popular key holder style I have for myself.
The two shells are identical, they fit 4 keys on each side and should be snap fit (your mileage may vary but it should be in the range of a bit of sand paper and/or a bit of glue to fix).
The author marked this model as their own original creation.