Can you change the default map via build command argument?

As the title states, I want to be able to use a command-line argument to change what the default map is when packaging a project. This is so I can use a build script to dynamically change what default map is used without having to update the ini. To be clear I don’t intend to update the ini file with this arg, just change what the default map is for that specific pack.

Is this possible?