I have one of these for the brief times I leave the bike unattended when away from home. https://www.sportsbikeshop.co.uk/motorcycle_parts/content_prod/275925 I wouldn’t leave it unattended on a city street given the easy of access and scrotes propensity to lift bikes into the back of vans but at places like Cadwell and Silverstone then at least the alarm aspect would draw attention. Plus it fits under the rear seat/cowl on a 959 so no added bulk!