Packaging tool for artist preview

hello!
First, I am pretty new on UE4 so sorry if this is a stupid question.
I am looking for a way to allow artists to update textures and possibly fbx assets without launching UE4.
Using the automation tool I am able to compile or cook my project using command line.

However, I am not able to find the command to force reimport of textures like the editor does.

The workflow I want to achieve is simple, the artist update his textures or objects, overwrite the files and then launch the command line. then he is able to launch the build and see his changes.

Maybe it is even simpler to replace .uassets in the packaged build directly, but I haven’t found how.

any tips about how I can do this?

thanks