Allow offline installer to install into an existing offline installation folder

I would like to offer an offline installer to my team to make the installation process smooth and fast. I do not know, which components the teams need, so it is a common use case that teams request additional components after the offline installer has been created and delivered to the users. Creating a new offline installer is possible, but users need to remove the existing installation and install the new one. This is not convenient for the end user. Adding all the components into the offline installer is not feasible, as the 4GB max file size will be exceeded. 

It would help if the components in the new offline installer could be installed into the same folder, which was created by the earlier offline installer.