LOL - I have the same dilemma - I'm on day 5 of stage 1 and miss my cereal big time....so I now plan to have my bowl of cereal with my one off meal at night.
I cant see any problem with this as we're allowed to eat anything for the evening meal and it can be anything and as many portions....but having it later could be a problem...I don't know...we'll see what the experts say.