Yup, that's the idea if I print or build it myself, to have the seat act as a second lock.
Another alternative is to mount it in front of the engine, on the bash guard or crash bars (I have neither). If it looks like an engine component, like a coolant box or something, it won't attract attention.
Touratech has one that fits over the gear lever, between their crash bars and engine with a top opening. But I still don't have crash bars and I don't think I'm going with Touratech.