One alternative I have played with (but never finished) was where Santanocheev successfully outmaneuvers Norris. He does this by successfully intercepting the Imperial Warrant, the planting rumors of a crash on Algine. When Norris' search comes up empty, he is pretty much ruined because of the RZ violation (let's assume there is shooting on Algine, too). At that point, facing his own ruination and Zhodani guns (remember, the Zhodani made it as far as Regina), he surrenders his duchy to the Zhodani.
The result is an independent Duchy of Regina (which includes the Imperial Jewell holdings) that is a Zhodani client state. Santanocheev, who won his battle with Norris, but loses the 5FW, is executed for treason when the truth comes out (to the nobility; the populace never finds out what happens), and Delphine is disgraced and while not replaced has her influence eliminated.
This ends up giving a more dynamic Spinward Marches, and unsettles established relationships (the Zhodani dump the Sword Worlds, and the Darrians are more isolated from their Imperial benefactors). In a way, it is a single-sector "rebellion".