This is a tough one. According to the city of Saskatoon website, it's illegal to ride on the sidewalk. Your argument that you think it's safer won't go anywhere in court -- the judge can't condone people making their own laws, chaos would result.
Your only hope is to show that the motorist was also breaking the law, and that his law-breaking or negligence did more to cause the accident than yours did. That's an uphill struggle, because you don't have any physical evidence, so it's just your word against his -- whereas you both agree that you were riding illegally, and you've already said so in a police report.
I think you're going to have a tough time of this.