Control: reassign -1 apt
The timing of when apt-listchanges gets called vs. when packages get installed is controlled by apt, not by apt-listchanges. While it would certainly be possible to add an option to apt to call apt-listchanges after rather than before the upgrade, and to omit the --confirm option when doing so since it obviously makes no sense to ask the user for confirmation afrer the upgrade has already happened, this change would need to be made in apt, not in apt-listchanges.