I would have no problem an Imperial Commando game. You could keep the same characters since the ending of RC is pretty close to the Republic to Empire transformation.
Of Course get add a new Teammate as a replacement for Sev. And if IC picked up right where RC left off, The Kashyyyk Invasion could be included as the first mission.
Or just have an expansion pack with some more SP missions. After all Delta Squad must have gone on plenty of different missions. Since it says they are being called on frequently.