Gosh, well done!
I agree that the lighting works better at the RHS, but it's no biggie - go with where they want.
The question I have is, have you sufficiently damaged the digital photo to match the quality of the scan? May I see a 100% crop?
This is not a crooked problem. You weren't square to the row of people. You should have moved to your right a bit.
So I figure you'll have to distort the perspective and hope for the best:
No you don't.
Your statement implies the assumption that your in-camera white balance is correct. But that is a false assumption in the majority of cases.