OP, you could offer this with a steak and BJ rebate program and some folks in here would find a problem with that.
A question for your market is what percentage of theft is from home, condo, parked on street/lot. That data would tell you abit about where the device would be helpful. Municipalities would be a tough sell to get it onto lots, many hoops to be jumped through. Selling 1 at a time to condo dwellers means needing distribution.
You could incorporate a vinyl coating into the bar so its non marking like some bicycle locks. Finding a manufacturer is the easy part, costing the product would be interesting.
Nothing is theft proof, theft resistant is the most you can hope for, making things more secure is an enormous market. Don't look at TO as a market, its a launch point. North America is a starting market.
And for the love of God protect your design if it has any legs, people make an excellent living selling engineering and design and having it made off shore. ( see princess auto wheel chock vs Baxley as example)