On the note of the music in the nightclub;
I know of two alternate sources of music that you could use. One is an artist that transforms ordinary songs into swing/lounge music - his name eludes me at the moment. However, there is the "Sketches on Star Wars" CD that I am listening to right now. It's jazzy/swing renditions of 10 cues of music from the Star Wars saga (IV-VI). The tracklist is as so:
01. Star Wars (Main Title)
02. Yoda's Theme (ESB)
03. Princess Leia's Theme (ANH)
04. Ewok Celebration (ROTJ)
05. Imperial March (ESB)
06. Han Solo and the Princess (ESB)
07. Jabba the Blues ("Han Solo at the Court of Jabba the Hutt" from ROTJ)
08. Luke and Leia (ROTJ)
09. Cantina Band (ANH)
10. May the Force Be With You (ESB)
What I was thinking was, you could use the jazz rendition of the Cantina Band song - I'm pretty sure it fits what kind of music you're looking for. You may want to slow it down just a tad, so it's not so lively, but I think it could work. Plus, it would tie in with the Originals, without repeating music per se. What do you think?
I'm not sure if anybody would've heard of this CD, but I can provide WAV files if needed - would just need filespace access - or I could split-rar it for you and email each piece over the course of a few days.