Liberty remains at war with Rheinland, so player-wise this can still be done even if the lore states that the conflict has slowed down. The Navy now diverts towards the west, defending the front opening up in California/Magellan, and stationing further forces alongside the Bretonian Armed Forces to defend New London, Manchester and Newcastle.
Kusari's eyes turn inwards as the Exiles move through Roussillon towards the Taus and Kyushu. While Gallia's main force is split between keeping order in Gallia against their home-grown criminals and those holding the invasion corridor from Orkney to Leeds, a civil war will start concerning the governing of Kusari.
My thoughts are that this could lead to the Emperor taking control of most of the forces (with a 'new Exile' force of the current Republicans) and re-entering the war against Gallia. Alternatively, if the Republicans maintain control but become aware of Libertonian/Bretonian support of the Exiles (assuming this happens) it could be the reason they open a front with Liberty alongside the Gauls in a later version.