I'll follow up on the examples that Holly was giving. There is the possibility of getting your voting kit electronically. This is what she was describing in New Zealand, for example, and Élise was describing it in France. Many countries have this, like Estonia and the Philippines. The ballot paper can be printed where you are and not sent to you. This can be done in a number of ways.
The other possibility is that once you have filled out your ballot, it can go back electronically. There's a possibility of combining these: For example, you download your ballot but you send it back by mail after signing the various forms.
There are many permutations that are being tried out there. What you end up landing on depends a lot on the trust and technology that you have in your own country. That's, I think, where the sticking point is. It isn't that it's not technologically possible; it's whether people would trust those systems. I think that's why Elections Canada has been cautious.
I would advise that this particular population is a good one to test it on. When you start looking at these options, it is often with your out-of-country voters that you start to test and see what works.
