There is a way easier than having to take another, fresh IELTS exam! That is by acing the citizenship exam itself, scoring 19/20, 18/20, etc. So far, all the posters who wrote about their success stories of using photocopies of IELTS without any problems DID manage to get good scores on their citizenship exams. That is one way of avoiding the interview, theoretically, because if the scores are high chances are that candidates won't be asked for interviews. If one is unfortunate to encounter an interview, then originals are needed.