And to extend this to the OP, I would definitely accept your idea of charting the Bass to the rhythm guitar. It makes perfect sense to do so in the absence of a bass, and I think a good majority of the reviewers would agree. Good luck, man.
Give it five to ten years, and it'll all be acceptable. Happened with "dumb", happened with "idiot", and it happened with "moron". Don't forget "spas" and "mental," either. Every derogatory term has a root in something, and drawing negative attention to a process that you can't stop just makes it all worse. =|Using terms like "gay" or "******ed" to describe objects or situations one disapproves of is immature, and not something I would expect from an XNA "Most Valuable Professional"