That you only want the the hex key, the handle or both; That you want metric, imperial or a custom size; Simply change the fusion360 parameters to your hex/allan key needs and obtain it and a fitting handle.

Here is a diagram of the main parametres needed to adjust the model to your needs.

Diagram modified (with the right parameter names) from : https://us.misumi-ec.com/vona2/detail/221004999578/

The handle halves press-fit together, but you can always add a bit of glue for more strength. Tolerances are adjustable as well to fit your printer's capabilities.