Not really sure what the course consists of to know whether I could get by or not.. I take u-turns and whatnot with no problems/issues on the R6, but I'd imagine the BRC gets tighter than that?
I havn't taken it either, but yes, I am sure it is tighter than that. Some more experienced guys will chime in, but my advice is if you're not confident you can do all maneuvers on your bike well, and you want to pass, take the class with 250's, or wait until you are confident.
Good luck either way