Changing the nature of Gallia's campaign to destroy all things sirius is a big mistake. It will only deform the nations motives itself and give people less reason to want to join it. Gallia was invented as a party that was uncompromising, and more forthcoming about inflicting doom upon all other cultures in sirius. You taint that and it just becomes more pointless than some think it already is.
Judging by my personal opinion, the aim was to end all the lawful wars currently ongoing throughout sirius so all would unite, beat Gallia back and restore order to this pandemonium. Gallia ends it's campaign, and all go on their merry.