Bernabo insisted on marrying one of his daughters to Gian Galeazzo's heir; Gian Galeazzo II would be 19 and presumably married in 1385, when Bernabo was seized and overthrown. I suppose if the marriage was scheduled sooner, say in 1381 when he would be 14, then GG could use the wedding to seize Bernabo and his sons and assume the government of Lombardy four years ahead of schedule; if all of Bernabo's sons attend the ceremony then that would tie up quite a few loose ends. Presumably he would then seek a match with either a French or German bride- most likely a Wittelsbach of Bavaria, as they would be the obvious rivals of the Luxemburgs and Austrians, and to defuse tensions with the duke, who had taken a daughter of Bernabo as his wife. Venice and Austria were at war in 1382, and Milan might well build on her historical anti-Carraran alliance to win the Venetians to his cause and conquer Trento alongside the Swiss and Bavarians. Azzone would presumably win the hand of Joanna II of Naples and rule jointly with her in Sicily, Croatia, and Provence after they are conquered, and Carlo Maria would be married to a daughter or sister of
John of Armagnac, to turn the count away from Carlo Visconti, as his army would be better used against Florence than on her behalf; I think that Tuscany would become an appanage under the Kingdom of Lombardy and Gian Galeazzo deliberately attempt to maintain unity of government in Padania. Alternately a march of Verona/Friuli/Treviso might re emerge as another appanage, but it seems too sensitive, and Venice likely to forcefully resist any encroachment by the Milanese.
Presuming that Louis of Orleans is successfully enticed into Italy via the offer of Bologna, then his "Kingdom of Adria" would in practice probably become a Lombard protectorate after he departs. Rome, whether captured by Clement or not, is likely to be forced into Milan's control, as the combination of Ladislaus and Gian Galeazzo is too powerful for a papacy weakened by the Schism to seriously resist, particularly if the Venetians are brought in by concessions in the Adriatic and Friuli. Spoleto seems like another necessary appanage, but there aren't enough sons- perhaps Azzone rules it in his own right, instead of usurping Joanna's rights in Naples; the moribund papal administration would have to be reconstituted as a secular government for the Visconti. Historically the Popes did not exercise meaningful authority in Romagna and the Marche until the early 16th century, so it would be the work of a few generations I think to subdue the princes of the Church.