Really glad to hear that, guys! We shall continue.
One thing I've been thinking about is having two of you take on the absent players, at least until the job is done. I don't think I can continue to run Savi and Avox, but they would each be pretty handy to have around (at least with the direction you currently have planned).
I will, of course, adjust things to make it possible with just the three of you as well. I'd remove those two from the story in a non-permanent way, though, in case they decide to come back.
So how about we finish the job and then re-evaluate? I would want to invite new players rather than just open it up, because I think you have all done a wonderful job of building and integrating your characters, and wouldn't want to lose that dynamic to a random element.
The protocol droid is also available as an NPC, should you want to stick with just the three of you. He's not very bright, but he does have other skills.