I'm actually not as worried about the Slingshot getting stolen as I am about getting molested, carjacked, robbed when I'm out & about.
I saw this "Driver Defense" rig, about $60 from Alien Gear Holsters & decided to try one.
The idea was that the shell holster could be swapped from the car rig to a paddle holster. I've had this two days & decided that's bunk. The shell is nice, covers the muzzle completely & protects it when riding in this position.
Thumb lock retention means Mr. Walther won't go bouncing around the cabin or fall out all together! The gear-looking knob locks into the receiver & allows any draw angle. Trouble is, when mounted on the paddle holster, it makes everything stick out at least an inch from your belt. I don't like the way it sticks out - way too conspicuous, bounces about too much.
The between the knees rig doesn't seem to interfere with pedal work (more testing needed), draw is quick & easy, so is reholstering. Great concealment, no need for a shoulder holster and vest. Gonna try this for a month, may still go back to a leather shoulder holster after all that!
I'll let everyone know how it works.