Currently, with the special ballot, you can fax in to Elections Canada as a way to prove your ID. I'm just suggesting that people should be able to do it at the returning office. There's enough time before polling day. Instead of the trouble of having to mail it to make it arrive, perhaps the returning officer can simply facilitate in getting it to the other riding or, in this case, Elections Canada.
We should encourage the use of the special ballot as much as we can. We're a busy society now, and people often just can't make the other times.