Don't worry about the excerpts, enjoy the pasta
Actually, saying that, I am just as much of a geek as you are - I was in Leipzig a couple of years ago, with one of the groups I tutor, and we were lucky enough to play a concert in the ThomasKirche - the church where Bach was Keppelmeister. I warmed up with a whole bunch of Bach excerpts, including Brandenburg - didn't do my chops any good whatsoever, but did bring a smile from a couple of the locals (who I got chatting to afterwards - both trumpeters and they appreciated my warm up
)