RealBand broke me some time ago because of it's bugs and crashing.
The main issue you have is that all your songs are in .SEQ format else there are plenty of other application that will do what you need for live performance.

You would have to sit down and > Save all Tracks to individual WAV/MID and then > Save Chords Window As Video
As I mentioned before, there should be a Batch Convert option for these 2 formats, that might be something easier to add to RB then fix all the bugs.
It might take time but the Jailbreak would be worth it.

But lets see what next month brings, you never know, fingers crossed.