Don't know if you're still looking, but if you are have a butchers at this.
https://lonerider-motorcycle.com/collec ... cycle-tent

youtuber onherbike switched from the MSR to this and has do a short vid about it,

Keep your waterproof trousers in a good carrier bag and when you come to put them on, put the bag over your boot. It makes it much easier to put your over trousers on and you'll be less likely to damage them.

Maybe you could pop into your local Suzuki dealer, they might be able to get you a lock for top box that will match your ignition key.