The C2 has a mechanical film advance lock, so make sure the red window is closed (or tape some foil over it). I would also suggest keeping the bellows racked in when not taking the pictures. You can also raise the internal baffle (unlock the lens change) if you want extra peace of mind.
The older (pre C330s) cameras have more metal and should be more IR safe as a result.
That is some sound, and well thought out advice.
I'll just have to try it. I'll report back to this thread.