The initial consideration would be that it not apply generally to a whole group, and by that I mean to the Canadian population and the idea that people could opt in if they wanted to. That would be too broad. You could restrict it to one, two, three, five ridings, or whatever, and to people with differing abilities—by the way, that's a Mexican expression. Instead of “disabled”, they say “differing abilities”. I like that a lot.
It could be those groups that do it, or people who have mobility issues and who would be able to say they have a mobility issue, and we would take their word for it. People don't lie about these things. We would be able to envelop that with control mechanisms that we could then use to check how well we performed and how well received it was by the electors, by the way. How much easier was it for the elector? If it's more burdensome than the present system, then why bother? That's how I would go about it.
I talked about parallel systems, by the way, so that we can ensure that what people are manifesting as their choice is really what is being manifested at the other end.