Many fundamental distributions are supported by DistroNavigator (their list is different for mp and mpd). Simpli (or another application on xfce) is not currently included among them, but it can be added. Let's include it. The user then starts a project based on Simple in the Navigator. This endeavour is initially a replica of Simpli. Then you can add certain packages to it, both required and included in optional groups (as opposed to adding users and settings, which is not the case)
. After that, you can build other projects, including off of current one.