The easier solution would be for the city to clear the sidewalks. If DOT can plow all the roads every time it snows, they should have no trouble doing sidewalks too. Otherwise you'll always end up with 25% of outer borough homeowners just not giving a shit and risking the tiny chance that they'll actually be fined.

If Canada can do it, we can too:

> Toronto is the third major winter city in North America to employ a city-wide sidewalk snow clearing program, along with Montreal and Ottawa.

https://www.toronto.ca/services-payments/streets-parking-transportation/road-maintenance/winter-maintenance/clearing-snow-and-ice-from-your-property/